The formula d = 6 t − 11 d=6t-11 expresses a car's distance (in feet) from a stop sign, d d, in terms of the number of seconds t t since it started moving. Determine the car's average speed over each of the following intervals of time.a. From t=3 to t=6 seconds...
b. From t=6 to t=6.5 seconds...
c. From t=6.5 to t=7 seconds...

Answer:

If repetition is allowed then the different call letters possible are 1404.

If repetition is allowed then the different call letters possible are 1250.

Step-by-step explanation:

The call letter are of either 2 letter or 3 letters.

And for them to be identified they should start with either E or W.

Consider the call letters with 2 letter:

Possible number of call letters starting with E : E _

The second place can be filled any of the 26 letters.

Possible number of call letters starting with W : W _

The second place can be filled any of the 26 letters.

Consider the call letters with 3 letter:

Possible number of call letters starting with E : E _ _

The second place and third place can be filled with any of the 26 letters.

Possible number of call letters starting with W : W _ _

The second place and third place can be filled with any of the 26 letters.

Total number of possible letters: 26 + 26 + (26)² + (26)² = 1404

Thus, if repetition is allowed then the different call letters possible are 1404.

Consider the call letters with 2 letter:

Possible number of call letters starting with E : E _

The second place can be filled any of the 25 letters.

Possible number of call letters starting with W : W _

The second place can be filled any of the 25 letters.

Consider the call letters with 3 letter:

Possible number of call letters starting with E : E _ _

The second place can be filled with any of the remaining 25 letters and the third can be filled with the remaining 24 letters.

Possible number of call letters starting with W : W _ _

The second place can be filled with any of the remaining 25 letters and the third can be filled with the remaining 24 letters.

Total number of possible letters: 25 + 25+ (25 × 24) + (26 × 24) = 1250

Thus, if repetition is allowed then the different call letters possible are 1250.

Answer:

3 pounds of vegetables bought were not on sale.

Step-by-step explanation:

Given:

Total pounds of vegetable bought by Manny = 12

Percentage of vegetables that are on sale = 75%

To find the pounds of vegetables that were not on sale.

Solution:

If the percentage of of vegetables that are on sale is 75%.

Then, the percentage of of vegetables that were not on sale is = [tex]100\%-75\%[/tex] = 25%

Total pounds of vegetable bought is 12 pounds, of which 25% were not on sale.

So, the pounds of vegetables that were not on sale is:

⇒ [tex]25\%\ of\ 12[/tex]

⇒ [tex]0.25\times 12[/tex]

⇒ 3

Thus, 3 pounds of vegetables bought were not on sale.

Answer:

56 drinks

Step-by-step explanation:

Given

n = 15-4 = 11 rounds (with one additional drink)

a₀ = 3*4 = 12 drinks (between the first and the fourth round)

r = 4 (number of drinks per round)

We can use the formula

aₙ = a₀ + n*r

⇒   a₁₁ = 12 + 11*4 = 12 + 44

⇒   a₁₁ = 56 drinks

Final answer:

The question involves calculating how much salt remains in a tank after 250 minutes when saltwater of a certain concentration is added and the solution is simultaneously drained at a different rate. A basic calculation suggests an addition of 1500 pounds to the initial 100 pounds, but the real answer must consider dilution and the tank's capacity, which complicates the calculation.

Explanation:

The question involves calculating the amount of salt in a tank after 250 minutes when saltwater is being pumped in and out at different rates. Initially, the tank has 100 pounds of salt and is then filled with a solution at a rate of 3 gallons per minute, with a concentration of 2 pounds of salt per gallon. Meanwhile, the tank is emptied at a rate of 1 gallon per minute.

To find the amount of salt in the tank after 250 minutes, we need to consider both the inflow and outflow of the tank. The net flow rate is 2 gallons per minute (3 gallons in - 1 gallon out). This leads to an increase in the volume of the tank by 2 gallons for every minute.

Every minute, 6 pounds of salt (3 gallons x 2 pounds/gallon) are added to the tank. However, since the tank's volume increases by 2 gallons per minute but 1 gallon is removed, we should adjust for the concentrate reduction due to dilution. Over 250 minutes, the total added salt is 250 minutes x 6 pounds/minute = 1500 pounds. However, the calculation must be adjusted to consider the dilution effect which is beyond the scope of this immediate calculation.

Initially, the tank contains 100 pounds of salt. Without accounting for dilution or maximum capacity effects, a simple addition suggests that after 250 minutes, 1600 pounds of salt would be in the tank. Yet, this simplistic approach does not account for dilution effect properly or the fact the tank has a maximum capacity, indicating that a more complex calculation is required for precise results.

the property of society getting the most from its scarce recources ... Fairness might require that everyone get an equal share because they were ... If you choose to use the $20 to go to the football game, your opportunity cost of going to the game is. $20 because you could have used that money on other things plus the value

The opportunity cost of going to the football game is $20 because you could have used that money to buy other things.

The correct answer to this question is b. $20 (because you could have used the $20 to buy other things).

Opportunity cost is the value of the next best alternative that you give up when making a decision. In this case, if you choose to use the $20 to go to the football game, you are giving up the opportunity to buy other things with that money.

There are no additional costs like the value of your time spent at the game or the cost of dinner because they are not explicitly mentioned in the question.

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Answer:

[tex]P(even )=\frac{20}{52} =\frac{5}{13}[/tex]

[tex]P(heart or diamond)=\frac{13}{52} +\frac{13}{52} =\frac{1}{2}[/tex]

[tex]P(nine or face card)=\frac{4}{52} +\frac{12}{52} =\frac{4}{13}[/tex]

Step-by-step explanation:

You draw one card at random from a standard deck of 52 playing cards

Total cards = 52

5 even numbers in each suit. 4 times 5 = 20 even number cards

[tex]P(even )=\frac{20}{52} =\frac{5}{13}[/tex]

(b) the card is a heart or a diamond

there are 13 heart and 13 diamonds

[tex]P(heart or diamond)=\frac{13}{52} +\frac{13}{52} =\frac{1}{2}[/tex]

(c) the card is a nine or a face card

There are 4 nine and 12 face cards

[tex]P(nine or face card)=\frac{4}{52} +\frac{12}{52} =\frac{4}{13}[/tex]

Answer:

The optimal Hedge Ratio is 0.7305.

Step-by-step explanation:

Optimal Hedge ratio is given as

[tex]HR_{optimal}=\epsilon_{correlation} \times \frac{\sigma_{current}}{\sigma_{future}}[/tex]

Here

So the Hedge Ratio is given as

[tex]HR_{optimal}=\epsilon_{correlation} \times \frac{\sigma_{current}}{\sigma_{future}}\\HR_{optimal}=0.86 \times \frac{0.79}{0.93}\\HR_{optimal}= \$0.7305[/tex]

So the optimal Hedge Ratio is 0.7305.

Answer:

The number of different ways to arrange the 9 cars is 362,880.

Step-by-step explanation:

There are a total of 9 cars.

These 9 cars are to divided among 3 racing groups.

The condition applied is that there should be 3 cars in each group.

Use permutation to determine the total number of arrangements of the cars.

       There are 9 cars and 3 to be allotted to group 1.

       This can happen in [tex]^9P_{3}[/tex] ways.

        That is, [tex]^9P_{3}=\frac{9!}{(9-3)!} =504[/tex] ways.

       There are remaining 6 cars and 3 to be allotted to group 2.

       This can happen in [tex]^6P_{3}[/tex] ways.

        That is, [tex]^6P_{3}=\frac{6!}{(6-3)!} =120[/tex] ways.

       There are remaining 3 cars and 3 to be allotted to group 3.

       This can happen in [tex]^3P_{3}[/tex] ways.

        That is, [tex]^3P_{3}=\frac{3!}{(3-3)!} =6[/tex] ways.

The total number of ways to arrange the 9 cars is: [tex]^9P_{3}\times ^6P_{3}\times ^3P_{3}=504\times120\times6=362880[/tex]

Thus, the number of different ways to arrange the 9 cars is 362,880.

Answer:

-5,7 those are the coordinates on the graph

Answer:

-5,7 this should be the answer

Answer:

  No

Step-by-step explanation:

The second and third figures are translations of each other. The first figure appears to be a reflection of the second, not a translation. Hence the first and third figures are not translations of each other.

__

If an image is translated, all of the pre-image line segments are parallel to the image line segments. That is not the case for the first and third figures, in which the top line segments go in different directions.

Answer:

b. No; it is a reflection followed by a translation.

Step-by-step explanation:

Answer:

Amount paid annually = $11241.42

Step-by-step explanation:

The steps are as shown in the attached file

Answer:

The confidence level that was used is 0.25% .

Step-by-step explanation:

We are given that mean of the selected sample of 16 accounts is $5,000 and a standard deviation of $400.

It has also been reported that the sample information indicated the mean of the population ranges from $4,739.80 to $5,260.20. This represents the Confidence Interval for population mean.

But we have to find that at what confidence level this information about range of population men has been stated.

Since we know that Confidence Interval for population mean is given by :

   C.I. for population mean = Sample mean(xbar) [tex]\pm[/tex] z value * [tex]\frac{Standard deviation}{\sqrt{n} }[/tex]

i.e.,if we have 95% C.I. = xbar [tex]\pm[/tex] 1.96 * [tex]\frac{\sigma}{\sqrt{n} }[/tex] .

So, our Confidence Interval for population is written as :

 [$4,739.80 , $5,260.20] = $5000 [tex]\pm[/tex] z value * [tex]\frac{400}{\sqrt{16} }[/tex]

 $5000 - z value * 100 = $4739.80    { Solving these we get Z value = 2.602}

 $5000 + z value * 100 = $5260.20

In z table we find that at value of 2.60 the probability is 0.99534 so subtracting this from 1 we get confidence level for one tail i.e.0.5%(approx).

Therefore, for two tail Confidence level will be 0.5%/2 = 0.25% .

Using the t-distribution, it is found that a confidence level of 98% was used.

We are given the standard deviation for the sample, which is why the t-distribution is used to solve this question.

The information given is:

The margin of error is of:

[tex]M = t\frac{s}{\sqrt{n}}[/tex]

In which t is the critical value.

For this problem, the margin of error is:

[tex]M = \frac{5260.2 - 4739.8}{2} = 260.2[/tex]

Hence, the critical value is found solving the equation of the margin of error for t.

[tex]M = t\frac{s}{\sqrt{n}}[/tex]

[tex]260.2 = t\frac{400}{\sqrt{16}}[/tex]

[tex]100t = 260.2[/tex]

[tex]t = \frac{260.2}{100}[/tex]

[tex]t = 2.602[/tex]

Looking at the t-table, with 16 - 1 = 15 df, t = 2.602 is associated with a confidence level of 98%.

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The point estimate of the population mean is 10, the point estimate for the population standard deviation is ~3.03. The margin of error for 95% confidence of the estimation of the mean is ~2.4. Therefore, the 95% confidence interval for the population mean is (7.6, 12.4).

To answer your questions, we begin by calculating basic measures of central tendency and variability.

a. The point estimate of the population mean is the average value of the data. It's calculated by adding up all the values and dividing by the number of values. In this case, (10+9+12+14+13+11+6+5)/8 = 10.

b. The point estimate of the population standard deviation (sd) is the root mean square deviation of the values from the mean. It's calculated by determining the square root of the variance, but let's use a calculator to get sd ≈ 3.03.

c. The margin of error for the estimation of the population mean at a 95% confidence level is calculated using the standard deviation and the size of the sample (for a t-distribution). This gives: MoE = t * (sd/sqrt(n)) ~ 2.3 * (3.03/sqrt(8)) = 2.44 (1 decimal place).

d. Finally, the 95% confidence interval for the population mean is determined by adding and subtracting the margin of error from the point estimate of the mean. Therefore, the 95% confidence interval for the mean is (10 - 2.4 , 10 + 2.4) = (7.6, 12.4).

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a. Point Estimate of Population Mean

Firstly, a point estimate for the population mean is the average of the sample data. For the given data (10, 9, 12, 14, 13, 11, 6, 5),  the point estimate is calculated by adding all the values and dividing by the number of observations:

(10 + 9 + 12 + 14 + 13 + 11 + 6 + 5) / 8 = 10

b. Point Estimate of Population Standard Deviation

To find the standard deviation, we use the formula for the sample standard deviation:

s =√[tex](\sum (x_i - \bar{x})^2[/tex] / (n - 1))

After calculating using the given data, we find that the point estimate of the population standard deviation, rounded to two decimal places, is s = 3.32.

c. Margin of Error for Mean Estimation

With the margin of error, we create the confidence interval by subtracting and adding the margin of error from the point estimate of the mean. This gives us the range of values in which we are 95% confident that the true population mean lies. The standard error of the sample mean is 3.24 / √8 ≈ 1.146,

so the margin of error at 95% confidence is  1.96 * 1.146 ≈ 2.24 (rounded to 1 decimal).

d. 95% Confidence Interval for Population Mean

The 95% confidence interval for the population mean is 10.375 ± 2.24, which gives us a range of (8.13, 12.62) (rounded to 1 decimal).

Answer:

The Scarecrow got it wrong.

Step-by-step explanation:

1. The Pythagoras theorem does not apply to every isosceles triangle. It only applies to a triangle that has one of its sides as a right angle i.e. 90 degrees.

2. The Pythagoras theorem deals with squares of sides not square roots of sides.

3. Pythagoras theorem does not state that the square of any side is equal to the sum of the remaining two. Instead, it states that the square of the hypotenuse of a right angled triangle is equal to the sum of the square of the remaining two sides.

4. The Pythagoras theorem does not mention anything about an isosceles triangle. It deals only with Right angled triangles.

The Scarecrow's statement has errors in terms of the type of triangle it refers to, the mathematical operation used, which sides of the triangle he's considering, and the side with which the sum is equated.

The Scarecrow in the 1939 film The Wizard of Oz did not correctly state the Pythagorean Theorem. There are a few errors in his statement:

The correct statement of the Pythagorean Theorem is: 'In a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.'

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Answer:

attached below

Step-by-step explanation:

The current as  t → [infinity] is 2/7 A if A 20-volt electromotive force is applied to an LR-series circuit in which the inductance is 0.1 henry and the resistance is 30 ohms

It is defined as the relationship between current and voltage according to the ohms law the voltage is directly proportional to the current.

It is given that:

A 20-volt electromotive force is applied to an LR-series circuit in which the inductance is 0.1 henry and the resistance is 30 ohms.

Using the equation:

LdI/dt + RI = v(t)

I(0) = 0

LdI/dt  = v(t)

V = 20 volts

After integration:

I = 2/7 + c

c = e⁻⁷⁰⁰ⁿ  (n = t) = 0

t → ∞

I = 2/7 A

Thus, the current as  t → [infinity] is 2/7 A if A 20-volt electromotive force is applied to an LR-series circuit in which the inductance is 0.1 henry and the resistance is 30 ohms

Learn more about the ohms law here:

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Answer:

The chart A is correct

Pareto Chart

Step-by-step explanation:

Given chart is missing (Attached)

Find:

- Which chart represents the correct data.

- What other chart can be used to express the given data

Solution:

- Use the given values for each color and compare with the three charts A,B and C given.

                For Blue =    A (12)    ,    B(12)    ,    C(11)

                For Green = A(7)       ,    B(13)    ,    C(12)

- Hence,  The chart A is correct.

- Any other chart which can correctly express the information given should be a chart that uses bars or frequency to expresses the percentages. Pareto Chart expresses both bars and line chart(curve) to express the frequency of the data.

Answer:

a) [tex](0.67-0.56) - 1.64 \sqrt{\frac{0.67(1-0.67)}{400} +\frac{0.56(1-0.56)}{400}}=0.054[/tex]  

[tex](0.67-0.56) + 1.64 \sqrt{\frac{0.67(1-0.67)}{400} +\frac{0.56(1-0.56)}{400}}=0.166[/tex]

And the 90% confidence interval would be given (0.054;0.166).  

b) [tex](0.31-0.25) - 1.64 \sqrt{\frac{0.31(1-0.31)}{180} +\frac{0.25(1-0.25)}{250}}=-0.0122[/tex]  

[tex](0.31-0.25) +1.64 \sqrt{\frac{0.31(1-0.31)}{180} +\frac{0.25(1-0.25)}{250}}=0.132[/tex]  

And the 90% confidence interval would be given (-0.0122;0.132).

c) [tex](0.46-0.61) - 1.64 \sqrt{\frac{0.46(1-0.46)}{100} +\frac{0.61(1-0.61)}{120}}=-0.260[/tex]  

[tex](0.46-0.61) +1.64 \sqrt{\frac{0.46(1-0.46)}{100} +\frac{0.61(1-0.61)}{120}}=-0.0404[/tex]  

And the 90% confidence interval would be given (-0.260;-0.0404).

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Part a

[tex]p_1[/tex] represent the real population proportion for sample 1

[tex]\hat p_1 =0.67[/tex] represent the estimated proportion for sample 1

[tex]n_A=400[/tex] is the sample size required for sample 1

[tex]p_2[/tex] represent the real population proportion for sample 2

[tex]\hat p_2 =0.56[/tex] represent the estimated proportion for sample 2

[tex]n_2=400[/tex] is the sample size required for sample 2

[tex]z[/tex] represent the critical value for the margin of error  

The population proportion have the following distribution  

[tex]p \sim N(p,\sqrt{\frac{p(1-p)}{n}})[/tex]  

The confidence interval for the difference of two proportions would be given by this formula  

[tex](\hat p_1 -\hat p_2) \pm z_{\alpha/2} \sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1} +\frac{\hat p_2 (1-\hat p_2)}{n_2}}[/tex]  

For the 90% confidence interval the value of [tex]\alpha=1-0.9=0.1[/tex] and [tex]\alpha/2=0.05[/tex], with that value we can find the quantile required for the interval in the normal standard distribution.  

[tex]z_{\alpha/2}=1.64[/tex]  

And replacing into the confidence interval formula we got:  

[tex](0.67-0.56) - 1.64 \sqrt{\frac{0.67(1-0.67)}{400} +\frac{0.56(1-0.56)}{400}}=0.054[/tex]  

[tex](0.67-0.56) + 1.64 \sqrt{\frac{0.67(1-0.67)}{400} +\frac{0.56(1-0.56)}{400}}=0.166[/tex]

And the 90% confidence interval would be given (0.054;0.166).  

Part b

[tex](0.31-0.25) - 1.64 \sqrt{\frac{0.31(1-0.31)}{180} +\frac{0.25(1-0.25)}{250}}=-0.0122[/tex]  

[tex](0.31-0.25) +1.64 \sqrt{\frac{0.31(1-0.31)}{180} +\frac{0.25(1-0.25)}{250}}=0.132[/tex]  

And the 90% confidence interval would be given (-0.0122;0.132).

Part c

[tex](0.46-0.61) - 1.64 \sqrt{\frac{0.46(1-0.46)}{100} +\frac{0.61(1-0.61)}{120}}=-0.260[/tex]  

[tex](0.46-0.61) +1.64 \sqrt{\frac{0.46(1-0.46)}{100} +\frac{0.61(1-0.61)}{120}}=-0.0404[/tex]  

And the 90% confidence interval would be given (-0.260;-0.0404).

To identify outliers from the data, the interquartile range (IQR) is used. Hypotheses are established to test if the mean time spent in the lab has increased. The test statistic and P-value are calculated with and without outliers to reach a conclusion.

To determine if there are any outliers in the provided data, we can use the interquartile range (IQR) method. Calculating IQR and then finding the lower and upper bounds will help us identify outliers. An outlier is a value that falls below Q1 - 1.5 * IQR or above Q3 + 1.5 * IQR. The hypotheses for our test are as follows:

The test statistic and P-value are calculated using the sample mean, standard deviation, and sample size, and comparing them with the presumed population mean of 54 minutes.

If outliers are identified and removed, we would calculate a new test statistic and P-value for the data set without the outliers to see if there is a significant change.

Answer:

1.66667

Step-by-step explanation:

You would do 5 divided by 3.

5 divided by 3 = 1.66667

You can verify this answer by multiplying 1.66667 * 3

1.66667 * 3 = 5

Hope this helps!!!

Answer:

a) [tex]S(s) = 14s^2[/tex]

b) [tex]V(s) = 3s^3[/tex]

c) [tex]S(s) = \dfrac{14V(s)}{3s}[/tex]

d) 56 square meter                                    

Step-by-step explanation:

We are given the following in the question:

A closed box with a square bottom is three times high as it is wide.

Let s be the side of square and h be the height.

[tex]h = 3s[/tex]

a) Surface area of box

[tex]2(lb + bh + hl)[/tex]

where l is the length, b is the breadth and h is the height.

Putting values:

[tex]S = 2(s^2 + sh +sh)\\S = 2(s^2 + 3s^2 + 3s^2)\\S(s) = 14s^2[/tex]

b) Volume of box

[tex]l\times b \times h[/tex]

where l is the length, b is the breadth and h is the height.

Putting values:

[tex]V = s\times s\times h\\V= s\times s\times 3s\\V(s) = 3s^3[/tex]

c) Surface area in terms of volume

[tex]S(s) = 14s^2 = \dfrac{14V(s)}{3s}[/tex]

d) Surface area

Volume = 24 m³

[tex]V(s) = 24\\3s^3 = 24\\s^3 = 3\\s = 2[/tex]

[tex]S(2) = 14(2)^2 = 56\text{ square meter}[/tex]

Answer:

Step-by-step explanation:

The concept of variance in random variable is applied in solving for the value of c for the estimator cW1 + (1 − c)W2 to be most efficient. Appropriate differentiation of the estimator with respect to c will give the value of c when the result is at minimum.

The detailed analysis and step by step approach is as shown in the attachment.

Answer:

The 7th percentile is 34.2

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

[tex]\mu = 46, \sigma = 8[/tex]

Find the 7 th percentile.

The value of X when Z has a pvalue of 0.07. So it is X when Z = -1.475.

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]-1.475 = \frac{X - 46}{8}[/tex]

[tex]X - 46 = -1.475*8[/tex]

[tex]X = 34.2[/tex]

The 7th percentile is 34.2

Answer:

No.

Step-by-step explanation:

The equipment wll save $35,000 per over for 10 years, which totals to $350,000.

If the equipment is bought on a simple interest rate of 12% annually for ten years, it will cost:

[tex]A = P (1 + rt),\\where\ A =\ Final\ amount,\ r=rate\of\interest\annually,\ t=time,\ P= Principal\ value\\\\P = 200,000r = 0.12t = 10 \\\\A = 200,000 ( 1 + 0.12\times 10)\\A = 200,000 (1 + 1.2)\\A = 200,000 (2.2)\\A = 440,000[/tex]

We will need to pay $440,000 in total for the machine in over ten years.

If we compare both values, it can be deduced that industrial equipment is more expensive than labor cost.

The decision to purchase the equipment depends on the calculation of Net Present Value, which factors in the cost of the equipment, annual saving, and interest rate. If the calculated NPV is greater than zero, it's worth investing, otherwise, it's not.

The subject of this question falls under the category of Business Finance, specifically the concept of Net Present Value (NPV). Given the costs of the equipment, the annual saving, and the interest rate (assumed to be 12%), we can calculate NPV. The net savings account for an annuity, which we assume to be $35,000 annually, and we end up with an NPV of cells (= 35000*(1-(1+0.12)^-10)/0.12 -200000). This value helps determine whether the investment is worthwhile. If the NPV is greater than 0, you should purchase the equipment as it indicates that the project's return exceeds the cost. However, if the NPV is less than 0, you should not purchase the equipment as it indicates that the project's cost exceeds the expected return.

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Answer:

343 in³ - B

Step-by-step explanation:

Volume of cube = l³ = 7 in x 7 in x 7 in = 343 in³

Answer: a) margin of error = 61.25, b) sample size when margin of error is 45 = 30

Step-by-step explanation:

The formulae to get the margin of error of a confidence interval is given as

Margin of error = critical value * (σ/√n)

Where σ = population standard deviation = 125

n = sample size = 16

Critical value =Zα/2 = 1.96 ( this is so because we are performing a 95% confidence level test then level of significance (α) will be 5% and since our test is of two values, it will be 2 tailed).

Margin of error = 1.96 * (125/√16)

Margin of error = 1.96 * 125/4

Margin of error = 1.96 * 31.25

Margin of error = 61.25

Question b)

Margin of error = 45

Critical value =Zα/2 = 1.96

Population standard deviation = σ = 125

Sample size =n =??

By recalling the formulae

Margin of error = critical value * (σ/√n)

45 = 1.96 * (125/√n)

45 = (1.96 * 125)/√n

45 = 245/√n

45 * √n = 245

√n = 245/ 45

√n = 5.444

n = (5.444)²

n= 29.64 which is approximately 30.

Final answer:

The margin of error calculation for estimating the mean weight of male baluga whales, determining the necessary sample size, and confirming the requirements for a confidence interval.

Explanation:

The margin of error in estimating the true mean weight of male baluga whales in the Arctic Ocean can be calculated using the formula:

Margin of Error = Z * (Standard Deviation / √sample size)

Given Z value for 95% confidence interval is 1.96,

Margin of Error = 1.96 * (125 / √16) = 61.25 kg.

To find the required sample size for a margin of error of 45 kg:

The requirements for the use of a confidence interval are considered met when the distribution of sample means is normal.

In this case, the distribution of sample means is normal because the sample size is large, ensuring the validity of utilizing a confidence interval for estimation.

Answer:

Mean = 0.3026

Median = 0.308

Mode = 0.327                    

Step-by-step explanation:

We are given the following data set:

0.327, 0.295, 0.318, 0.310, 0.285, 0.280, 0.314, 0.323, 0.310, 0.295, 0.283, 0.279, 0.277, 0.313, 0.327, 0.306, 0.327, 0.317, 0.292, 0.275

[tex]Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}[/tex]

[tex]Mean =\displaystyle\frac{6.053}{20} = 0.3026[/tex]

Sorted data: 0.275, 0.277, 0.279, 0.280, 0.283, 0.285, 0.292, 0.295, 0.295, 0.306, 0.310, 0.310, 0.313, 0.314, 0.317, 0.318, 0.323, 0.327, 0.327, 0.327

[tex]Median:\\\text{If n is odd, then}\\\\Median = \displaystyle\frac{n+1}{2}th ~term \\\\\text{If n is even, then}\\\\Median = \displaystyle\frac{\frac{n}{2}th~term + (\frac{n}{2}+1)th~term}{2}[/tex]

[tex]\text{Median} = \dfrac{10^{th} + 11^{th}}{2} = \dfrac{0.306 + 0.310}{2} = 0.308[/tex]

Mode is the mos frequent observation in the data.

Mode = 0.327

It appeared 3 times.

The mean of the MLB Batting Averages is around 0.306, the median is 0.308, and the mode is 0.327.

In the field of mathematics, especially in statistics, mean, median and mode are measures of central tendency that provide an overview of the data set. Given the MLB Batting Averages, we start by arranging the data in ascending order. After that, we calculate the mean by adding up all the values and dividing by the number of values. The median is the middle value in an ordered dataset, and the mode is the value that appears most often in a dataset.

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Answer: A. - 1/a

Step-by-step explanation:

Two lines are said to be perpendicular if the product of their slope equals -1 . That is , if the slope of the first line is [tex]m_{1}[/tex] and the slope of the second line is [tex]m_{2}[/tex] , if they are perpendicular , then :

[tex]m_{1}[/tex] x [tex]m_{2}[/tex] = -1.

Therefore : the perpendicular slope to m is [tex]\frac{-1}{a}[/tex]

Answer:

a) 43.56% probability that George loses two staring contests in a​ row.

b) 18.97% probability that George loses four staring contests in a​ row.

Step-by-step explanation:

In each staring contest, George has a 66% probability of losing.

(a) What is the probability that George loses two staring contests in a​ row?

[tex]P = (0.66)^{2} = 0.4356[/tex]

43.56% probability that George loses two staring contests in a​ row.

(b) What is the probability that George loses four staring contests in a​ row? Assume that each game played is independent of the rest.

[tex]P = (0.66)^{4} = 0.1897[/tex]

18.97% probability that George loses four staring contests in a​ row.

The probability of George losing two staring contests in a row is approximately 43.56%, while the probability of him losing four staring contests in a row is approximately 19.7%.

To calculate the probability that George loses two staring contests in a row, we need to multiply the probability of losing one staring contest by itself. Since George loses 66% of all staring contests, the probability of losing one contest is 0.66. Therefore, the probability of losing two contests in a row is 0.66 multiplied by 0.66, which is approximately 0.4356 or 43.56%.

To calculate the probability that George loses four staring contests in a row, we again need to multiply the probability of losing one contest by itself four times. So, the probability is 0.66 raised to the power of 4, which is approximately 0.197 or 19.7%.

Answer:

a) P(X = 0) for raisins = 0.33287

b) P(X = 2) for chocolate chips = 0.14379

c) P(X ≥ 2) for both bits = 0.59399

Step-by-step explanation:

The average amount of raisin per cookie is 600/500 = 1.2

The average amount of chocolate chips per cookie = 400/500 = 0.8

a) Using Poisson's distribution function

P(X = x) = (e^-λ)(λˣ)/x!

For raisin, Mean = λ = 1.1

x = 0

P(X = 0) = (e⁻¹•¹)(1.1⁰)/(0!) = 0.33287

b) Using Poisson's distribution function

P(X = x) = (e^-λ)(λˣ)/x!

For chocolate chips, Mean = λ = 0.8

x = 2

P(X = 2) = (e⁻⁰•⁸)(0.8²)/(2!) = 0.14379

c) the probability that a randomly chosen cookie will have at least two bits (raisins or chips) in it.

For this, the average number of bit in a raisin = (600+400)/500 = 2 bits per raisin.

P(X ≥ 2) = 1 - [P(X = 0) + P(X = 1)]

For P(X = 0)

P(X = x) = (e^-λ)(λˣ)/x!

Mean = λ = 2

x = 0

P(X = 0) = (e⁻²)(2⁰)/(0!) = 0.13534

For P(X = 1)

P(X = x) = (e^-λ)(λˣ)/x!

Mean = λ = 2

x = 1

P(X = 1) = (e⁻²)(2¹)/(1!) = 0.27067

P(X ≥ 2) = 1 - [P(X = 0) + P(X = 1)]

P(X ≥ 2) = 1 - (0.13534 + 0.27067) = 1 - 0.40601 = 0.59399

Using the Poisson distribution, it is found that there is a:

a) 0.3012 = 30.12% probability that a randomly picked cookie will have exactly two chocolate chips.

b) 0.1438 = 14.38% probability that a randomly picked cookie will have exactly two chocolate chips.

c) 0.594 = 59.4% probability that a randomly chosen cookie will have at least two bits (raisins or chips) in it.

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by:

[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]

The parameters are:

Item a:

600 raisins in 500 cookies, hence, the mean is:

[tex]\mu = \frac{600}{500} = 1.2[/tex]

The probability is P(X = 0), hence:

[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]

[tex]P(X = 0) = \frac{e^{-1.2}1.2^{0}}{(0)!} = 0.3012[/tex]

0.3012 = 30.12% probability that a randomly picked cookie will have exactly two chocolate chips.

Item b:

400 chips in 500 cookies, hence, the mean is:

[tex]\mu = \frac{400}{500} = 0.8[/tex]

The probability is P(X = 2), hence:

[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]

[tex]P(X = 2) = \frac{e^{-0.8}0.8^{2}}{(2)!} = 0.1438[/tex]

0.1438 = 14.38% probability that a randomly picked cookie will have exactly two chocolate chips.

Item c:

1000 bits, as 600 + 400 = 1000, in 500 cookies, hence, the mean is:

[tex]\mu = \frac{1000}{500} = 2[/tex]

The probability is:

[tex]P(X \geq 2) = 1 - P(X < 2)[/tex]

In which:

[tex]P(X < 2) = P(X = 0) + P(X = 1)[/tex]

[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]

[tex]P(X = 0) = \frac{e^{-2}2^{0}}{(0)!} = 0.1353[/tex]

[tex]P(X = 1) = \frac{e^{-2}2^{1}}{(1)!} = 0.2707[/tex]

Hence:

[tex]P(X < 2) = P(X = 0) + P(X = 1) = 0.1353 + 0.2707 = 0.4060[/tex]

[tex]P(X \geq 2) = 1 - P(X < 2) = 1 - 0.406 = 0.594[/tex]

0.594 = 59.4% probability that a randomly chosen cookie will have at least two bits (raisins or chips) in it.

A similar problem is given at https://brainly.com/question/16912674

Answer: X = {0,1,2,3,4,5,....970}

Explanation: Let  X → random nonconforming solder connections on a printed circuit board. The number has to be a whole number to indicate the connections. This gives all possible range of X = {0,1,2,3,4,5,....970}

The number of solder connections would always be discrete, hence, a positive integer value. The range of possible values which the variable could have are {1, 2, 3,..., 970}

Number of solder connections would always be a whole number, as it cannot be negative or be a fractional value, hence, the possible range of values will be discrete.

Hence, the possible range can be expressed in the form :

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