Eighteen less than the quotient of twelve and a number is written as:
[tex]\frac{12}{x} - 18[/tex]
Solution:
Given statement is:
Eighteen less than the quotient of twelve and a number
We have to translate the given sentence into algebraic expression
Let "x" be the number
Therefore,
Eighteen less than the quotient of twelve and "x"
Quotient means result of division
Therefore,
[tex]\frac{12}{x} - 18[/tex]
Which means, 18 less than quotient of 12 and x
Thus the given sentence is translated into algebraic expression
The phrase 'eighteen less than the quotient of twelve and a number' is mathematically expressed as 12/n - 18, where n represents the unknown number.
The expression 'eighteen less than the quotient of twelve and a number' translates to a mathematical operation. First, we find the quotient of twelve and a number, which is the result of dividing twelve by that number (let's call it n). Then, we subtract eighteen from that quotient. The algebraic representation of this expression is 12/n - 18.
It's important to follow mathematical rules and order of operations correctly when performing such calculations, similarly to how the rules of arithmetic must be applied correctly regardless of the context, as is described in the example of counting goats or students. Mathematics provides various methods to arrive at the correct answer, and in this case, simplifying the operation is straightforward. It is a demonstration of understanding the correct usage of mathematical operations as well as number fluency.
6th grade math, assignment attached
she wants the base length of this triangle to be 8 inches. the area of the pennant must be less than 36 square inches
Answer: The height/width has to be less than 9 for the area to be less than 36
Step-by-step explanation:
Pennant's are triangle.
Triangle area = bh(1/2)
the base is 8in
(8 * h)/2 = 36
*2
8 * h = 72
/8
h = 9
The height/width has to be less than 9
There are 25 students in the class. Ten students have sports practice after school. What is the ratio of students that do have practice, to those that do not?
Answer:
10/25 or 2/5
Step-by-step explanation:
since only 10 have sport as all the other students don't
Can somebody please help me answer this and please also explain where I can understand . Thank you .
Answer:
a. 1/10
b. 4/10
c. 20
Step-by-step explanation:
There are 10 equal sections.
a. 1 section is labeled "Large Prize", so the probability of winning a large prize is 1/10.
b. 1 section is labeled "Large Prize" and 3 sections are labeled "Small Prize", so there's 4 prize section. Therefore, the probability of winning a prize is 4/10.
c. Each person has a 4/10 chance of winning a prize. So if there are 50 people, we would expect 4/10 × 50 = 20 people to win a prize.
Drag the tiles to the correct boxes to complete the pairs.
Match each transformation or sequence of transformations to an equivalent transformation or sequence of transformations.
a 90° counterclockwise rotation about the origin
a 180° rotation about the origin
a 90° clockwise rotation about the origin
Answer:
a 90° clockwise rotation about the origin
a 180° rotation about the origin
a 90° counterclockwise rotation about the origin
Step-by-step explanation:
Transformations are done on a Cartesian Plane, which is the grid with four quadrants. (See picture) Each quadrant is 90°, so two quadrants is 180°.
When you rotate counterclockwise it is like in the picture. When you want to rotate clockwise, it's the other way.
When we rotate 180°, it does not matter if it is counterclockwise or clockwise because the result is the same (both move two quadrants).
We can imagine an example to help us solve the problem. Let's say we are rotating an object starting in first quadrant. (Upper right quadrant).
Find out which quadrant the object ends up with each instruction:
FROM THE PICTURE:
"a 90° counterclockwise rotation about the origin (Q2) and then a 180° rotation about the origin"
End: Quadrant 4
"a reflection across the x-axis (Q4) and then a reflection across the y-axis"
End: Quadrant 3
"a 90° clockwise rotation about the origin (Q4) and then a rotation 180° about the origin"
End: Quadrant 2
FROM YOUR LIST:
"a 90° counterclockwise rotation about the origin " Quadrant 2
"a 180° rotation about the origin " Quadrant 3
"a 90° clockwise rotation about the origin" Quadrant 4
Match each ending quadrant from your list with the same ending quadrant from the picture.
The order that you should put your list into the boxes is:
a 90° clockwise rotation about the origin
a 180° rotation about the origin
a 90° counterclockwise rotation about the origin
It takes 22 pounds of seed to completely plant a 4-acre field. How many pounds of seed are needed per acre?
Answer:
5.5 pounds of seeds
Step-by-step explanation:
22 pounds seeds = 4-acre field
(x) pounds seeds = 1-acre(per acre)
x= 22/4
= 5.5 pounds of seeds
Steve gets $100 a week, plus 15% of sales. Which equation best represents his salary?
A.) y = 100x + 0.15
B.) y = 0.15x + 100
C.) y = -0.15 x + 100
D.) y = -100x +0.15
Answer y = 0.15x + 100
Step-by-step explanation:
Mrs.Rome has 2/3 of a pan of lasagna left after dinner she wants to divide the leftover lasagna into 4 equal servings what fraction of the original pan does each serving represent
[tex]\frac{1}{6}[/tex] of the original pan represents each serving
Solution:
Given that,
Mrs.Rome has 2/3 of a pan of lasagna left after dinner
She wants to divide the leftover lasagna into 4 equal servings
2/3 is divided into 4 equal servings
Therefore,
[tex]1\ equal\ serving = \frac{\frac{2}{3}}{4}\\\\1\ equal\ serving = \frac{2}{12} = \frac{1}{6}[/tex]
Thus [tex]\frac{1}{6}[/tex] of the original pan represents each serving
If 4 liters of motor oil cost 3.88 dollars, what is the price for one liter
Answer:
.97 cents
Step-by-step explanation:
3.88 divided by 4 = .97
Answer:
97¢
Step-by-step explanation:
If 4 liters cost $3.88, then divide 4 into 3.88
Which function has a domain of (-∞, ∞) and a range of (-3, ∞)?
Answer:
Step-by-step explanation:
The function that will have the domain [tex](\infty, \infty)[/tex] and a range of [tex](-3, \infty)[/tex] is the
function in option d.) [tex]f(x) = e^x - 3[/tex]
Solve for x: the quantity of x plus 16 all over 3 = 3x (1 point) x = −7 x = −13 x = 8 x = 2
Step-by-step explanation:
We have,
[tex]\dfrac{x+16}{3}=3x[/tex]
To find, the value of x in the given equation = ?
∴ [tex]\dfrac{x+16}{3}=3x[/tex]
By crossmultiplication, we get
3(3x) = x + 16
⇒ 9x = x + 16
⇒ 9x - x = 16
⇒ 8x = 16
⇒ x = [tex]\dfrac{16}{8}[/tex]
⇒ x = 2
∴ The value of x = 2
Thus, the required value of x is equal to 2.
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At an ice carving competition, each carver starts with a block of ice with the dimensions shown. The block is
wrapped in a special reflective material to keep it from melting before the competition starts.
3 ft
4 ft
How much reflective material is needed to cover the block completely, without any overlaps?
feet
The question cannot be fully answered as provided since only two dimensions of the ice block are given. To determine the amount of reflective material, all three dimensions (length, width, height) of the block are needed to calculate the total surface area. Without the third dimension, the exact surface area cannot be calculated.
Explanation:The question asks how much reflective material would be needed to cover a block of ice with given dimensions completely for an ice carving competition. Since only two dimensions are provided, let's assume the block has a third dimension making it a rectangular prism. To find the surface area of the block (which is the amount of reflective material needed), we calculate the area of each face and sum them up. A rectangular prism has six faces: the front and back, the top and bottom, and the two sides. If we denote the dimensions of the block as length (l), width (w), and height (h), the areas of the respective faces are:
Front and back: l * h eachTop and bottom: l * w eachSides: w * h eachAssuming the dimensions provided are the length and height (l = 3 ft and h = 4 ft), and an unknown width (w), we cannot calculate the exact surface area without the third dimension. Ideally, the width would be provided to complete the calculation.
if I work 2 days a week and get 8 dollars a day. How much will I make in 3 months
Tamar travels 8/9 miles to the grocery store. Melkon travels 10 miles to the grocery store. Write the ratio of the distance Melkon travels to the distance Tamar travels as a fraction in simplest form. Write the ratio of the distance Tamar travels to the distance Melkon travels as a fraction in simplest form. PLZ I NEED URGENT HELP I NEED THE ANSWER
[tex]\frac{\text{Distance of melkon}}{\text{Distance of tamar}} = \frac{45}{4}\\\\\frac{\text{Distance of tamar}}{\text{Distance of melkon}} = \frac{4}{45}[/tex]
Solution:
Given that,
Tamar travels 8/9 miles to the grocery store
Melkon travels 10 miles to the grocery store
Therefore,
[tex]Tamar = \frac{8}{9}\ miles\\\\Melkon = 10\ miles[/tex]
Write the ratio of the distance Melkon travels to the distance Tamar travels[tex]\text{ Distance of melkon : Distance of tamar } = 10 : \frac{8}{9}\\\\\text{ Distance of melkon : Distance of tamar } = \frac{10 \times 9}{1 \times 9} : \frac{8}{9}\\\\\text{ Distance of melkon : Distance of tamar } = \frac{90}{9} : \frac{8}{9}\\\\\text{ Distance of melkon : Distance of tamar } =90 : 8\\\\In\ fraction\ form\\\\\frac{\text{Distance of melkon}}{\text{Distance of tamar}} = \frac{90}{8}\\\\In\ simplest\ form\\\\\frac{\text{Distance of melkon}}{\text{Distance of tamar}} = \frac{45}{4}[/tex]
Write the ratio of the distance Tamar travels to the distance Melkon travels[tex]\text{ Distance of tamar : Distance of melkon } = \frac{8}{9} : 10\\\\\text{ Distance of tamar : Distance of melkon } = \frac{8}{9} : \frac{10 \times 9}{1 \times 9}\\\\\text{ Distance of tamar : Distance of melkon } = \frac{8}{9} : \frac{90}{9}\\\\\text{ Distance of tamar : Distance of melkon } = 8 : 90\\\\In\ fraction\ form\\\\\frac{\text{Distance of tamar}}{\text{distance of melkon}} = \frac{8}{90}\\\\\frac{\text{Distance of tamar}}{\text{distance of melkon}} = \frac{4}{45}[/tex]
Thus the required are found
Write equivalent fractions to 2.5
Answer:
5/2 or 2 1/2
Step-by-step explanation:
Which of the following values are in the range of the function graphed below? Check all that apply.
A. 2
B. 1
C. 3
D. 5
E. -2
Answer:
1, 2, 3
Step-by-step explanation:
The range includes only the y-axis. On this graph, the line only passes by the 1,2, and 3 on the y-axis.
The figure on the left represents a scale drawing of the figure on the right. What is the scale?
Answer:
[tex]\frac{1}{90}[/tex]
Step-by-step explanation:
Before calculating the scale we require the dimensions to be in the same units.
Using the conversion
1 yard = 3 ft and
1 foot = 12 inches, then
5 yards = 5 × 3 × 12 = 180 inches
The scale is then
2 in : 180 in ← divide both quantities by 2
= 1 : 90
= [tex]\frac{1}{90}[/tex]
The scale of the drawing given is 1/90
Using the following conversion :
1 yard = 3 feets 1 feet = 12 inchesThis means that ;
1 yard = 12 * 3 = 36 inchesThen ;
5 yards = 36 * 5 = 180 inchesRelating the expression :
2 inches = 180 inches
divide both sides by 2
1 inch : 90 inches
Hence, the scale is 1 /90
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When Luis begins painting, he realizes it takes him 45 seconds to complete 1 square foot. The room he is painting has 272 square feet. How many seconds will it take Luis to complete the project? Now, convert this to minutes?
It will take Luis 12240 seconds to complete the project.
12240 seconds are 204 minutes when converted.
Step-by-step explanation:
Given,
Time taken to paint 1 square foot = 45 seconds
Time taken for 272 square feet = 45*272
Time taken for 272 square feet = 12240 seconds
We know that;
60 seconds = 1 minute
Therefore;
We will divide the total seconds by 60 to convert them into minutes.
12240 seconds = [tex]\frac{12240}{60} = 204\ minutes[/tex]
It will take Luis 12240 seconds to complete the project.
12240 seconds are 204 minutes when converted.
Keywords: conversion, multiplication
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Write the equation of a line that passes through the point (-2, 1) and has a slope of 4.
2. All
OA. y=4x - 7
OB. y= 4x+1
OC. y= 4x+3
OD. y= 4x + 9
Question serial: 1154203447-dhwm78.2
Answer:
look at picture shown please
If f(x)=4x 2 +5x+2, then what is the remainder when f ( x ) is divided by x + 7?
Answer:
Step-by-step explanation:
Final answer:
The remainder when the function f(x) = 4x² + 5x + 2 is divided by x + 7 is found using the remainder theorem, which gives us a result of 163.
Explanation:
To find the remainder when the function f(x) = 4x² + 5x + 2 is divided by x + 7, we can use the remainder theorem. The remainder theorem states that if a polynomial f(x) is divided by a linear divisor of the form x - r, the remainder is f(r). Here, our linear divisor is x + 7, which we can rewrite as x - (-7). So, we substitute x = -7 into the polynomial to get the remainder.
Substituting x = -7 into the function gives us:
f(-7) = 4(-7)² + 5(-7) + 2 = 4(49) - 35 + 2 = 196 - 35 + 2 = 163.
Therefore, the remainder when f(x) is divided by x + 7 is 163.
what is the distance between -2/3 and 4/3 on a number line?
A number line can be defined as a horizontal line that can be extended and have numbers on it. The distance between -2/3 and 4/3 on a number line is 3 units.
What is a number line?A number line can be defined as a horizontal line that can be extended in any direction indefinitely and has all the integers over it. As one walks from left to right on the number line, the numbers grow, and as one proceeds from right to left, the numbers decrease.
The distance between the two can be found by deducting -2/3 from 4/3. Therefore, the distance between the two can be written as,
[tex]\rm Distance = \dfrac{4}{3}-(- \dfrac{2}{3}) = \dfrac{4}{3}+\dfrac{2}{3} = \dfrac{4+2}{3} = \dfrac{6}{3} = 2[/tex]
Thus, the distance between -2/3 and 4/3 on a number line is 3 units.
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Braden jumped
9 5/16 feet in the long jump. jordan jumped 8 7/8 feet. how much farther did braden jump than jordan?
the options were
A. 7/16 of a foot
B. 9/16 of a foot
C. 1 7/16 of a foot
D. 1 9/16
Option A: 7/16 of a foot is the right answer
Step-by-step explanation:
Given
Length of Braden's Jump = [tex]9\frac{5}{16} = \frac{149}{16}[/tex] feet
Length of Jordan's Jump = [tex]8\frac{7}{8} = \frac{71}{8}[/tex]
In order to find how much farther Braden jumped than Jordan
[tex]=\frac{149}{16} - \frac{71}{8}\\=\frac{149-142}{16}\\=\frac{7}{16}[/tex]
Braden jumped 7/16 feet farther than Jordan
Hence,
Option A: 7/16 of a foot is the right answer
Keywords: Fractions, measurements
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Final answer:
By converting Jordan's jump to sixteenths and subtracting it from Braden's, we determine that Braden jumped 9/16 of a foot farther than Jordan. The correct answer is option B.
Explanation:
The question involves finding out how much farther Braden jumped than Jordan. To solve this, we subtract Jordan's jump length from Braden's jump length. Braden jumped 9 5/16 feet, and Jordan jumped 8 7/8 feet.
First, we need to find a common denominator to subtract the fractions. The common denominator for 16 and 8 is 16. Convert Jordan's jump to sixteenths: 8 7/8 equals 8 14/16.
Now, subtract Jordan's jump from Braden's: 9 5/16 - 8 14/16 = 1 - 9/16. Braden jumped 9/16 of a foot farther than Jordan.
So the correct answer is option B. 9/16 of a foot.
Write the following sentence using mathematical symbols.
Twice the difference of x and 3 is greater than the reciprocal of 14.
Answer:
[tex]2(x - 3)\: >\: \frac{1}{14}[/tex]
Step-by-step explanation:
The difference of x and 3 is given as:
x-3
Twice the difference of x and 3 becomes:
2(x-3)
The reciprocal of 14 is
[tex] \frac{1}{14} [/tex]
Twice the difference of x and 3 is greater than the reciprocal of 14 then becomes
[tex]2(x - 3)\: >\: \frac{1}{14} [/tex]
please help asap will give brainliest
Answer:
1) a = 3189 b = 5
2) a = 53 b = -5
Step-by-step explanation:
Name the restrictions on x then solve showing your steps. 2/(x-3)= 5/x
Answer:
Restrictions: x ≠ 0, 3
The value of x is equal to 5.
General Formulas and Concepts:
Pre-Algebra
Distributive PropertyAlgebra I
Equality Properties
Multiplication Property of EqualityDivision Property of EqualityAddition Property of EqualitySubtraction Property of EqualityTerms/Coefficients
Expanding/FactoringDomain
Step-by-step explanation:
Step 1: Define
Identify given.
[tex]\displaystyle \frac{2}{x - 3} = \frac{5}{x}[/tex]
Step 2: Examine
Since we have an x - 3 and x in the denominator, we must make sure the denominator cannot equal 0, or that would get us an undefined answer. Therefore, our restrictions are that x ≠ 0, 3.
Step 3: Solve for x
[Multiplication Property of Equality] Cross-multiply:Since 5 is not equal to 0 or 3, it can be our solution.
∴ we have found the value of x from the given rational function.
---
Topic: Algebra I
You can buy school uniforms though an online catalog.Boys can order either navy blue or khaki pants with a red,white,or blue shirt.How many uniform combinations are there online for boys
Answer:
6 combinations
Step-by-step explanation:
Pants options: Navy Blue, Khaki
Shirt options: Red, white, blue
Possible combinations:
Navy Blue with: Khaki with:
Red Red
White White
Blue Blue
There are 6 outfit possibilities
Hope this helps and let me know if you have any questions about my answer :)
What is the relationship between cos(90°) and cos(-90°)?
Answer:
they have the same value (0)
Step-by-step explanation:
Cosine is an even function, meaning that cos(x) = cos(-x). When x=90°, we have ...
cos(90°) = cos(-90°)
Both values happen to be zero.
The relationship between cos(90°) and cos(-90°) is that they both equal 0.
Explanation:The relationship between cos(90°) and cos(-90°) can be explained using the unit circle. In the unit circle, the cosine function represents the x-coordinate of the point on the circle corresponding to the given angle.
For cos(90°), the x-coordinate is 0, which means the cosine value is 0.
For cos(-90°), the x-coordinate is also 0, so the cosine value is also 0. Therefore, cos(90°) = cos(-90°) = 0.
What is the answer 5(9 + p) = 125
Answer:
p=17
The drawing will help
Answer: p = 16
Step-by-step explanation: To solve for p in this equation, our first step is to simplify the left by distributing the 5 through both terms inside the parentheses.
When we do that,
we get 5 times 9 which is 45 and 5 times p which is 5p.
So we have 45 + 5p = 125.
Our next step is to isolate the p term by subtracting 45 from both sides of the equation. On the left side of the equation, 45 - 45 cancels and we're left with 5p.
On the right side of the equation, 125 - 45 simplifies to 80.
So we have 5p = 80.
We want to solve our equation for p so we want to get p by itself on the left side of the equation. Since p is being multiplied by 5, we need to divide both sides of the equation by 5. On the left side of the equation.notice that the 5 and 5 cancel each other out so we're just left with p and on the right side, 80 divided by 5 is 16 so we have p = 16.
A small bottle of Dr.Pepper holds 31.2 cm^3 of the delicious drink. For a New Years Eve party, you need enough juice to fill 6 cone- shaped glasses that have a 4cm diameter and a 3 cm height. How many full bottles of Dr. Pepper do you need to buy to completely fill the 6 glasses you need?
Approximately 3 bottles are needed to buy to completely fill the 6 glasses you need
Solution:
Given that,
A small bottle of Dr.Pepper holds 31.2 cm^3 of the delicious drink
Therefore,
[tex]Volume\ of\ small\ bottle\ of\ Dr.pepper = 31.2\ cm^3[/tex]
For a New Years Eve party, you need enough juice to fill 6 cone- shaped glasses that have a 4 cm diameter and a 3 cm height
Find the volume of cone
[tex]V = \frac{\pi r^2h}{3}[/tex]
Where, r is the radius and h is the height
Diameter = 4 cm
Radius = 4/2 = 2 cm
Height = 3 cm
Therefore,
[tex]V = \frac{3.14 \times 2^2 \times 3}{3}\\\\V = \frac{3.14 \times 12}{3}\\\\V = \frac{37.68}{3}\\\\V = 12.56[/tex]
Thus, for 6 cone shaped glasses:
Volume of 6 cone shaped galsses = 12.56 x 6 = 75.36 [tex]cm^3[/tex]
How many full bottles of Dr. Pepper do you need to buy to completely fill the 6 glasses you need?
[tex]\text{Number of Dr.pepper bottles } = \frac{\text{Volume of 6 cone shaped galsses}}{\text{Volume of small bottle of dr pepper}}\\\\\text{Number of Dr.pepper bottles } = \frac{75.36}{31.2}\\\\\text{Number of Dr.pepper bottles } = 2.4153[/tex]
Thus approximately 3 bottles are needed to buy to completely fill the 6 glasses you need
Final answer:
To fill 6 cone-shaped glasses for a New Year's Eve party, you would need to buy 3 full bottles of Dr. Pepper. The volume of each glass is calculated using the formula for the volume of a cone, and then this volume is multiplied by 6 to find the total volume required for all glasses. The number of bottles needed is found by dividing this total volume by the volume of one bottle of Dr. Pepper.
Explanation:
To determine how many full bottles of Dr. Pepper you need to buy to fill 6 cone-shaped glasses with a 4cm diameter and a 3cm height, we need to calculate the volume of one glass and then multiply it by 6 to get the total volume required. The formula to calculate the volume of a cone is V = (1/3)πr^2h, where V is the volume, r is the radius of the base, and h is the height of the cone.
First, we find the radius of the glass by dividing the diameter by two, which yields 2cm. Plugging the values into the formula, we get:
V = (1/3)π(2^2)(3) = (1/3)π(4)(3) = 4π cm^3
Since π is approximately 3.14, we can simplify this to:
V = 4(3.14) cm^3 = 12.56 cm^3 per glass.
Now, multiplying the volume of one glass by 6 gives us the total volume needed:
Total volume = 12.56 cm^3/glass × 6 glasses = 75.36 cm^3.
To find out how many bottles of Dr. Pepper are needed, we divide the total volume by the volume of one bottle:
Number of bottles = 75.36 cm^3 / 31.2 cm^3/bottle ≈ 2.415 bottles.
Since you cannot buy a fraction of a bottle, you would need to purchase 3 full bottles of Dr. Pepper to ensure you have enough to fill all 6 glasses.
The following data represent the number of people aged 25 to 64 years covered by health insurance (private or government) in 2018. Approximate the mean and standard deviation for age.
Age: 25-34. 35-44. 45-54. 55-64
Number 22.1. 31.5. 37.7. 25.3
(Millions)
The approximate mean age is [tex]\(45.15\)[/tex] years, and the approximate standard deviation for age is [tex]\(9.22\)[/tex] years, both rounded to two decimal places.
To approximate the mean and standard deviation for the age groups provided, we can calculate the weighted average based on the midpoint of each age group and use the formula for the standard deviation of a weighted dataset.
First, calculate the midpoints of the age groups:
- For 25-34 years: midpoint = (25 + 34) / 2 = 29.5
- For 35-44 years: midpoint = (35 + 44) / 2 = 39.5
- For 45-54 years: midpoint = (45 + 54) / 2 = 49.5
- For 55-64 years: midpoint = (55 + 64) / 2 = 59.5
Next, calculate the weighted mean using the formula:
[tex]\[ \text{Weighted Mean} = \frac{\sum (\text{Midpoint} \times \text{Number of People})}{\sum \text{Number of People}} \][/tex]
[tex]\[ \text{Weighted Mean} = \frac{(29.5 \times 22.1) + (39.5 \times 31.5) + (49.5 \times 37.7) + (59.5 \times 25.3)}{22.1 + 31.5 + 37.7 + 25.3} \][/tex]
[tex]\[ \text{Weighted Mean} \approx \frac{651.45 + 1244.25 + 1867.35 + 1503.35}{116.6} \][/tex]
[tex]\[ \text{Weighted Mean} \approx \frac{5266.4}{116.6} \][/tex]
[tex]\[ \text{Weighted Mean} \approx 45.15 \text{ years (approx)} \][/tex]
Now, calculate the standard deviation using the formula:
[tex]\[ \text{Weighted SD} = \sqrt{\frac{\sum (\text{Number of People} \times (\text{Midpoint} - \text{Weighted Mean})^2)}{\sum \text{Number of People}}} \][/tex]
[tex]\[ \text{Weighted SD} = \sqrt{\frac{(22.1 \times (29.5 - 45.15)^2) + (31.5 \times (39.5 - 45.15)^2) + (37.7 \times (49.5 - 45.15)^2) + (25.3 \times (59.5 - 45.15)^2)}{116.6}} \][/tex]
[tex]\[ \text{Weighted SD} \approx \sqrt{\frac{9919.575}{116.6}} \][/tex]
[tex]\[ \text{Weighted SD} \approx \sqrt{85.004} \][/tex]
[tex]\[ \text{Weighted SD} \approx 9.22 \text{ years (approx)} \][/tex]
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