Option d is correct
What is the "multiple regression" model:y=β0+β1x1+β2x2+β3x3+........+βkxk+ε
Where y is the "independent" variable and 0 to k are the "regression" coefficients. In a "multiple linear regression" model, the "independent" variables are x1, x2, x3,..., xk, and the "residual" or "error" term is.
The "residual" for the regression model is calculated using the following formula.
Residual=y-ŷ
Where y is the "independent variable's" "actual" value and is the "independent variable's" "predicted" value.
The "difference" between the "actual" value of the "dependent" variables and the corresponding "predicted" value when employing the "multiple regression" model is referred to as the "residual" in the "residual" formula.
A statistical technique for evaluating the relevance of a "multiple regression" model is the "F test." Linear models are A linear model is a statistic that explains the “relationship” between “response” and “predictor” variables. Using the “multiple regression” model, the “predicted” value of the “response” variable is denoted by ŷ.
hence option 4 is correct
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I understand you mean:
What is a residual for a multiple regression model and the data that is used to create it? Select one:
1.A statistic that is used to evaluate the significance of the multiple regression model
2.A statistic that explains the relationship between response and predictor variables
3.The predicted value of the response variable using the multiple regression model
4.The difference between the actual value of the response variable and the corresponding predicted value (regression error) using the multiple regression model
Kaitlyn is trying to put in a water pipe underneath the
ground for her pool. The pipe will run from point G(c,6) to
point H(-5,d) on the coordinate grid. Which expression
represents the shortest distance between M and N in
units.
The shortest distance between the two points is √[(c + 5)² + (6 - d)²]
How to determine the shortest distance between the two points?From the question, we have the following points that can be used in our computation:
G = (c, 6) and H = (-5, d)
The distance between the two points can be calculated using the following distance equation
distance = √[(x₂ - x₁)² + (y₂ - y₁)²]
Where
(x, y) = (c, 6) and (-5, d)
Substitute (x, y) = (c, 6) and (-5, d) in distance = √[(x₂ - x₁)² + (y₂ - y₁)²]
distance = √[(c + 5)² + (6 - d)²]
Hence, the distance expression is √[(c + 5)² + (6 - d)²]
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At $4.20 per yd^3, how much will it cost to fill a container with dimensions of 3yd X 5yd X 7 1/3 yd?
Cost to fill the container = $ 462
The volume of the rectangular container:The area that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere. Various forms have various volumes.
The formula for the volume of a rectangular container is given by
Volume = Length × Width × Depth
Here we have,
Dimensions of a container are 3yd × 5yd × 7 1/3 yd
Here 7 1/3 = 22/3 yd
From the given formula,
Area of the container = 3yd × 5yd × 22/3 yd
= [tex](3 \times 5 \times \frac{22}{3} )yd^{3}[/tex]
= [tex]( 5 \times 22 )yd^{3}[/tex]
= 110 yd³
Given the cost per 1 yd³ = $ 4.20
=> cost of 110 yd³ = 110 × $ 4.20 = $ 462
Therefore,
Cost to fill the container = $ 462
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Characteristics in common with 2 miles 72,000 inches and 3,000 feet
Answer:
Step-by-step explanation:
1 foot=12inch
3000 feet=12 ×3000=36000 inches
72,000 inches=2 miles
36000 inches=(2÷72,000)×36,000=1 mile
The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced to a mass of 6 mg. Round your answers to 5 decimal places as needed. What was the initial mass (in mg) of the sample? What is the mass 7 weeks after the start?
Rounded to 5 decimal places, the initial mass of the sample was 48.00000 mg, and the mass 7 weeks after the start was 0.00002 mg.
What is the half-life of a substance?
Half-life is the time required for the amount of something to fall to half its initial value. The converse of half-life is doubling time.
The half-life of a substance is the time it takes for half of the initial mass of the substance to decay.
Since the half-life of Palladium-100 is 4 days, after 4 days, the mass of the sample will be reduced to half of its initial value. After 8 days, it will be reduced to a quarter of its initial value, and after 12 days it will be reduced to an eighth of its initial value.
We are given that after 12 days, the mass of the sample is 6 mg. This means that the initial mass of the sample was 8 * 6 mg = 48 mg.
After 7 weeks (7 * 7 = 49 days), the mass of the sample will be reduced by a factor of
= [tex]8^{(49/4) }[/tex]
= [tex]8^{12.5}[/tex] =
approximately [tex]2.6 * 10^6[/tex]. The mass of the sample after 7 weeks will be approximately [tex]\frac{6 mg }{2.6 * 10^6}[/tex] = approximately [tex]2.3 * 10^{-6}[/tex] mg.
Rounded to 5 decimal places, the initial mass of the sample was 48.00000 mg, and the mass 7 weeks after the start was 0.00002 mg.
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Find sin2x,cos2x, and tan2x if sin x=12/13 and x terminates in quadrant II.
sin2x=
cos2x=
tan2x=
Trigonometry is the branch of mathematics that deals with particular angles' functions and how to use those functions in calculations. There are six popular trigonometric functions for an angle. Sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant are their respective names and acronyms (csc).
Given:
sin x= 12/ 13
So, B = √13² - 12² = √169 - 144 = √25 = 5
cos x= -5/ 13
So, sin 2x= 2 sin x cos x =2 (12/13)(-5/13) = -120/169
and, cos 2x= 1- 2 sin²x
= 1- 2( 144 / 169)
= -119/ 169
and, tan 2x = sin 2x/ cos 2x = 120/ 169 / (- 119/ 169)= 120/ 119
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Find the inverse function in slope-intercept form (mx+b): f(x)= -3x+3
The inverse function of f(x) = -3x + 3 in slope-intercept form is g(y) = (-1/3)y + 1.
What is the inverse function?
The inverse function of a function f(x) is a function g(x) such that g(f(x)) = x for all x in the domain of f.
The given function is f(x) = -3x + 3. To find the inverse function, we can solve for x in terms of y:
y = -3x + 3
0 = -3x + y + 3
-y = -3x + 3
x = (-y + 3) / -3
The inverse function is then g(y) = (-y + 3) / -3. Rewriting this in slope-intercept form gives:
g(y) = (-1/3)y + 1
Hence, the inverse function of f(x) = -3x + 3 in slope-intercept form is g(y) = (-1/3)y + 1.
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What is the range of possible values for x ?
The diagram is not to scale
The range of possible values for x is 0<x<20
What is Range?The Range is the difference between the lowest and highest values.
In any triangle, the smallest angle is opposite to the smallest side.
So, In ΔABD , the side which faces ∠ABD is AD whose length is 32 units.....(1)
And, in ΔCBD, the side which faces ∠CBD is CD whose length is 20 units....(2)
Now, from equations (1) and (2) We get,
∠ABD < ∠CBD
So, ∠ABD lies between 0° to 48°
0<4x+8<48
Subtract 8 on both sides
-8<4x<40
Divide by 4
-2<x<10
As ∠ABD lies between 0° to 48°, so 0<x<10 is the range.
Hence, 0<x<10 is the range of possible values for x.
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The width of the rectangle is 60% of its length of 40 ft. What is the area of the rectangle?
Answer:
24
Step-by-step explanation:
60% of 40 is 24 because to find a percentage, multiply the percent you are trying to find (60%) by the number you are trying to find percent of (40) and divide the answer of 60x40 by 100. 60x40 is 2,400. 2,400 divided by 100 is 24. The width of the rectangle is 24ft
If A (2,2) and B is (-2, -2) what is the distance between AB?
The distance AB between the two points is 5.7 units
How to determine the distance AB between the two points?From the question, we have the following parameters that can be used in our computation:
A = (2, 2) and B =(-2, -2)
The distance between the two points can be calculated using the following distance equation
distance = √[(x₂ - x₁)² + (y₂ - y₁)²]
Where
(x, y) = (2, 2) and (-2, -2)
Substitute (x, y) = (2, 2) and (-2, -2) in distance = √[(x₂ - x₁)² + (y₂ - y₁)²]
distance = √[(2 + 2)² + (2 + 2)²]
Evaluate
distance = 5.7
Hence, the distance is 5.7 units
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A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data were recorded: Advertising Costs ($) 40 Sales ($) 385 20 400 25 395 20 365 475 30 50 440 40 490 20 420 50 560 525 40 25 480 50 510 a) Plot a scatter diagram, you may use Excel. (5 marks) b) Find the equation of the regression line to predict weekly sales from advertising expenditures. (6 marks) c) Estimate the weekly sales when advertising costs are $35. (2 marks) d) Plot the residuals versus advertising costs. Comment. (5 marks) e) Using the t-test, test the hypothesis that 6 against the alternative that B< 6. Use a 0.025 level of significance. (10 marks) f) Construct a 95% confidence interval for the average weekly sales when $45 is spent on advertising. (5 marks) g) Construct a 95% prediction interval for the average weekly sales when $45 is spent on advertising (5 marks) h) What is the percentage of variations in weekly sales explained by the advertising costs? (2 marks)
For given data,
a) A scatter diagram is as shown below.
b) the coefficient of correlation is, r = 0.63
c) the linear regression equation (least-squares equation of the line) to predict weekly sales from advertising expenditures is : y = 3.2208x + 343.71, where x is the Advertising Costs and y be the Sales in dollars
d) when advertising costs are $32, the weekly sales would be 446.78 dollars.
In this question, we have been given that a retail merchant made a study to determine the relation between weekly advertising expenditures and sales.
The following data were recorded:
Advertising Costs, $ 40 20 25 20 30 50 40 20 50 40 25 50
Sales, $ 385 400 395 365 475 440 490 420 560 525 480 510
a) a scatter plot for the above data is as shown below.
b) the coefficient of correlation is:
r = √0.403
r = 0.63
c) the linear regression equation is:
y = 3.2208x + 343.71
where x is the weekly Advertising Costs and y be the Sales in dollars
d) the weekly sales when advertising costs are $32:
y = 3.2208(32) + 343.71
y = 446.78
So, when advertising costs are $32, the weekly sales would be 446.78 dollars.
Therefore, for given data:
a) A scatter diagram is as shown below.
b) the coefficient of correlation = 0.63
c) the linear regression equation: y = 3.2208x + 343.71
d) when advertising costs are $32, the weekly sales would be 446.78 dollars.
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Work out the size of an exterior angle of a regular polygon with 8 sides.
The admission fee at an amusement park is $1.50 for children and $4 for adults. On a certain day, 396 people entered the park, and the admission fees collected totaled 1,094.00 dollars. How many children and how many adults were admitted?
Therefore by solving the equations we get to know that 196 children and 200 adults were present on that day.
What is equation?
equation, a declaration of equivalence between two expressions with variable- and/or number-filled expressions. In essence, equations are questions, and efforts to discover a method for answering them have fueled the growth of mathematics. Equations range in complexity from straightforward addition-and-multiplication equations in mathematics through differential equations, exponential equations that use exponential expressions, and integral equations.
Let's initially configure our system by giving the letters x and y meanings. Assume x is the number of kids and y is the number of adults.
Children are priced at $1.50, while adults are priced at $4.00. We multiply the total number of children, x, by 1.5 to get how much each child will cost. 1.5x is used to indicate this. We will use 4y for adults, whose entry fee is $4. On the specified day, $1094 in total revenue was earned. This sum requires the addition of 1.5x and 4y.
1.5x + 4y = 1094 works for the money equation involved.
Second equation: The total number of individuals present on the day is 283. X and Y, or the number of children and adults, must be added together to arrive at this figure.
x + y = 396
System of equations:
1.5x + 4y = 1094
x + y = 396
Thus,
x + y = 396
y = 396- x
Substitute y = 396 - x into the first equation.
1.5x + 4 (396 - x) = 1094
1.5x + 1584 - 4x = 1094
1584 - 2.5x = 1094
-2.5x = -490
x = 196
Substitute x =196 back into y = 396 - x
y = 396 - 196 = 200
Therefore by solving the equations we get to know that 196 children and 200 adults were present on that day.
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In gym class, a student can do 40 sit-ups in 60 seconds and 100 sit-ups in 150 seconds.
Graph the proportional relationship.
graph with x axis labeled time seconds and y axis labeled sit ups, with a line from 0 comma 0 going through 90 comma 60
graph with x axis labeled time seconds and y axis labeled sit ups, with a line from 0 comma 0 going through 60 comma 30
graph with x axis labeled time seconds and y axis labeled sit ups, with a line from 0 comma 0 going through 60 comma 50
graph with x axis labeled time seconds and y axis labeled sit ups, with a line from 0 comma 0 going through 90 comma 30
PLEASE HELP, its not D btw i did the test and got it wrong
D, graph with a line from 0 comma 0 to 90 comma 30 and an x axis labeled time seconds and a y axis labeled sit ups represents the proportional relationship.
How do graphs work?For the graphical representation of data points on both the horizontal and vertical lines of a cartesian coordinate, which are the x-coordinate (x-axis) and y-coordinate, a graph is a sort of chart that is frequently employed (y-axis).A straight line with data points passing through the origin characterizes the graph of any proportional relationship in mathematics (0, 0).In this situation, it is logically inferable that the values on the x- and y-coordinates of the provided graph are proportional and are represented by the following linear equation:Explanation:
y = 3x
where x is the passage of time.
y stands for how many sit-ups there were.
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In the diagram, the length of segment VS is 39 units. Line n is a perpendicular bisector of line segment T V. It intersects line segment T V at point R. Line n also contains points Q and S. Line segment Q V is 3 x + 4. Line segment R V is 2 x + 5. Line segment T S is 6 x minus 3. What is the length of segment TV? 14 units 19 units 38 units 50 units
On solving the provided question, by help of the Linear Equation we got that TV = 38 units.
what is linear equation?Any equation with a degree of 1 or above is considered linear. This shows that the exponent of the linear equation's variable is bigger than 1. A linear equation will always have a straight line as its graph.
RST and RSV, two equal right triangles, are shown in the illustration.
Notice that:
TS = VS
We know that,
TS = 6x - 3
VS = 39
6x - 3 = 39
6x = 42
[tex]x = \frac{42}{6}[/tex]
x = 7
Now, you can identify in the figure that:
RV = 2x + 5
The length of segment RV may be determined by substituting the above-calculated value of "x" into the equation and evaluating:
RV = 2(7)+ 5
RV = 19 units
Now,
TV = 19 + 19
TV = 38 units
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A bag contains five red marbles, four blue marbles, and four yellow marbles. You randomly pick a marble. What is the probability that the marble is red or blue?
The probability that the marble is red or blue is 0.6923 or 69.23% if the bag contains five red marbles, four blue marbles, and four yellow marbles. You randomly pick a marble.
What is probability?It is defined as the ratio of the number of favorable outcomes to the total number of outcomes, in other words the probability is the number that shows the happening of the event.
We have the total number of marbles = 5+4+4 =13
Total number of red and blue marble = 5+4 = 9
The probability that the marble is red or blue = 9/13 = 0.6923 or
= 69.23%
Thus, the probability that the marble is red or blue is 0.6923 or 69.23% if the bag contains five red marbles, four blue marbles, and four yellow marbles. You randomly pick a marble.
Hope this helps!!! :)
(Special thanks to JaneWright Brainly tutor!!!)
Answer:
66% and 2/3
Step-by-step explanation:
100% divided by 3 is 33% and 1/3
Hope that helps! :)
does anyone know the answers?
Answer:
1. Supplementary
2. Alternate exterior
Step-by-step explanation:
1. ∠1 and ∠2 are complementary because they both lie on the same straight line. If you had the values of these angles, they would add up to 180°
2. ∠1 and ∠8 are alternate exterior angles because they are on opposite sides of the transversal (the diagonal line from the bottom left to the top right) and they are on the outsides of the parallel lines. (∠1 is above the top horizontal line and ∠8 is below the bottom horizontal line.)
A man walks for 2 hours at a certain speed. He then cycles at three times that seed for
4 hours. He goes 77km altogether. Find the speed at which he walks.
5.5km/hr is the speed at which he walks.
What is Equation?Two or more expressions with an Equal sign is called as Equation.
Given
w = walking speed
t = time walking = 2
Given, A man walks for 2 hours at a certain speed which is 2w
He then cycles at three times that seed for 4 hours.
We can form a equation by given data
2w + 3×w×4 = 77
2w+12w=77
14w = 77
Divide both sides by 14
w = 5.5 km/hr
Hence, 5.5km/hr is the speed at which he walks.
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If g(x)=f(x-3), then select all the statements that are true.
The value of g(1) is 3 .
The value of g(-1) is 1 .
The value of g(-1) is 8 .
The y-intercept of g(x) is at the point (0,1).
The true statement is The value of g(1) is 3 .
What is Function?In mathematics, a function is represented as a rule that produces a distinct result for each input x. In mathematics, a function is indicated by a mapping or transformation. Typically, these functions are identified by letters like f, g, and h. The collection of all the values that the function may input while it is defined is known as the domain. The entire set of values that the function's output can produce is referred to as the range. The set of values that could be a function's outputs is known as the co-domain.
Given:
g(x)=f(x-3)
When x= 1
g(1) = f(-2)= 3
and, When x= -1
g(1) = f(-2)= -1
Hence, the true statement is The value of g(1) is 3 .
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Julie wanted to match Lisa's obstacle course record of 73.4 seconds. She has already spent twenty and one-fourth seconds on wall climbing and 11.78 seconds on the ropes. How much time did she have left to match the record? 61.62 seconds 53.15 seconds 41.37 seconds 8.47 seconds
The time required to match the record is 41.37 seconds. The correct option is (c).
What are arithmetic operations?The arithmetic operations are the fundamentals of all mathematical operations. The example of these operators are addition, subtraction, multiplication and division.
The given problem can be solved as follows,
The remaining time for matching the record is given by,
73.4 - (20(¹/₄) + 11.78)
= 73.4 - (81/4 + 11.78)
= 73.4 - (20.25 + 11.78)
= 73.4 - 32.03
= 41.37
Hence, the time Julie have left to match the record is 41.37.
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Angela has 21 3/8 cups of flour. She uses 2 1/4 cups of flour to make each batch of cookies. Part A. How many batches of cookies can Angela make? Part B. Write an equation to model the solution to the problem.
Using proportions, Angela can make 9.5 batch of cookies and the equation to model the solution is y = 2.25x
What are ProportionsProportion is an equation that defines that the two given ratios are equivalent to each other. However, in this case, we can write out an equation that shows the number of cookies she can make with the number of cups of flour available.
To do this, we need to set up a proportional equation with a constant of proportionality.
This is often written as
y = kx
k = constant of proportionalityFor each batch, she needs 2 1/4 cups
Let's convert this into decimal which will give us 2.25 cups of flour.
y = 2.25x
A. The number of batch she can make will be
21 3/8 ÷ 2 1/4 = 9.5 batch
B) The equation to model the solution is y = 2.25x
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What is the answer to -6v-1+v
Answer:
-6v-1+v
collect the like terms
-6v + v - 1
you have
-5v-1
Answer:
answer is 5v-1
Step-by-step explanation:
add the common varribles which are V,
A copy machine makes 44 copies per minute. How long does it take to make 165 copies?
What is GM?
I need the answer pleaseee help me
Answer: 18
Step-by-step explanation:
[tex]\triangle HJK \cong \triangle HLK[/tex] by HL. Therefore, [tex]JK=2[/tex] by CPCTC.
Using the segment addition postulate, [tex]GK=9[/tex].
Furthermore, [tex]\triangle HGK \cong \triangle HMK[/tex] by HL. This means that [tex]MK=9[/tex] by CPCTC.
Using the segment addition postulate again, [tex]GM=9+9=18[/tex].
opinion 1: coefficient of x, coefficient of y, constant term
opinion 2: divide -105 by 3, divide 165 by 3, write the equation in slope-intercept form
opinion 3: -55, -35, 35, 55
Answer:
Coefficient of x
Write in the slope intercept form
35
Step-by-step explanation:
165 - 105x + 3y = 0 Subtract 165 from both sides and and 105x to both sides
3y = 105x - 165 Divide all the way through by 3
y = 35x - 55
The slope is the coefficient of x when the equation is written in the slope intercept form of the line.
The slope is 35
Type the 4letter code into the answer box. All CAPS, no spaces.
Answer:
HAEC
Step-by-step explanation:
You want the code letters associated with lines 1–4 on the graph.
Line 1Has a y-intercept of -4, and a rise/run if 1/4. The equation is ...
y = 1/4x -4 (H)
Line 2Has a y-intercept of -4, and a rise/run of 4/1 = 4. The equation is ...
y = 4x -4 (A)
Line 3Has a y-intercept of 3, and a rise/run of -2/1 = -2. The equation is ...
y = -2x +3 (E)
Line 4Has a y-intercept of +1 and a rise/run of 2/1 = 2. The equation is ...
y = 2x +1 (C)
The code is HAEC.
I need help with this.
Answer:
Step-by-step explanation:
ax² + bx + c = 0
D = b² - 4ac
If D > 0 , then quadratic equation has 2 roots.
If D = 0 , then quadratic equation has 1 roots.
If D > 0 , then quadratic equation has No roots in the set of real numbers.
~~~~~~~~~~~~~~~~~~~~
2y² + 4y = 3
2y² + 4y - 3 = 0
a = 2 , b = 4 , c = - 3
D = 4² - 4(2)( - 3) = 40 > 0 ( 2 solutions )
[tex]y_{12}[/tex] = ( - 4 ± 2√10 ) ÷ 4
[tex]y_{1}[/tex] = [tex]\frac{-2+\sqrt{10} }{2}[/tex]
[tex]y_{2}[/tex] = [tex]\frac{-2-\sqrt{10} }{2}[/tex]
If the function g (« = f(a) + k, where k = 2, describe the changes to the slope and y-intercept of this transformation.
The changes to the slope and y-intercept of this transformation are
The slopes of the functions are the sameThe y-intercept of g(a) is 2 greater than the y-intercept of f(a)How to determine the changes to the slope and y-interceptFrom the question, we have the following parameters that can be used in our computation:
g(a) = f(a) + k
Also, from the question, we have
k = 2
Using the above as a guide, we have the following:
Substitute the known values in the above equation, so, we have the following representation
g(a) = f(a) + 2
This means that
Slope of f(a) = Slope of g(a)
Also, we have
y-intercept of g(a) = y-intercept of f(a) + 2
Hence, the y-intercept of g(a) is 2 greater than the y-intercept of f(a)
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Let G(x) = -2(3x + 4)(x - 1)(x – 3)^2 be a polynomial function.
Find the Y intercept and state the end behavior of g(x).
The vertical intercepts is (4/3,0) (3,0) (1,0) and The horizontial intercepts is (0,72)
The end behavior is as x approaches positive infinity, f(x) approaches negative infinity. As x approaches negative infinity, f(x) approaches negative infinity.
What is a function?Function is a type of relation, or rule, that maps one input to specific single output.
Given the G(x) = -2(3x + 4)(x - 1)(x – 3)^2 as a polynomial function.
Since all the exponets will equal 0. The constant will just add to the term.
The leading degree is even. Thus Even Degree Polynomials like Quadratics tend to go approach positive infinity vertically as x approaches positive infinity, and as x approaches negative infinity, it approaches positive infinity vertically.
Our leading coefficient is negative which means our quadratic will get reflected across the x axis.
The end behavior is as x approaches positive infinity, f(x) approaches negative infinity. As x approaches negative infinity, f(x) approaches negative infinity.
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The ratio of men to women working for a company is 5 to 6. If there are 308 employees total, how many women work for the company?
Answer:
Step-by-step explanation:
115 woman
USING YOUR MATH
4. A semi-truck is being loaded with boxes of varying weights. The total weight of boxes loaded is shown below as a function of the number of boxes loaded into the truck.
(a) For each interval below, find the average rate of change. Do not round. Include units with your answers.
5 to 11 boxes:
11 to 20 boxes:
20 to 25 boxes:
(b) Over which interval was the average weight per box the greatest?
5. A hot liquid was placed in a freezer and its temperature was recorded. The data for the first 8 minutes is shown below.
At what average rate is the temperature changing from 2 to 8 minutes? Use proper units.
Average rate of change for interval 5 to 11 boxes is 4.5 , 11 to 20 boxes is 6 and 20 to 25 boxes is 3.2
What is average rate of change?Average rate of change can be defined as slope of function between two fixed values of x. It can also be defined as change in function per unit or we can say as an average.
Average rate of change (from x = a to x=b) = [tex]\frac{f(b)-f(a)}{b-a}[/tex]
Given table can we represented as No.of boxes = x
Total weight = y
So, for x = 5 , y = 18
x = 11 , y = 45
x = 20 , y = 99
x = 25 , y = 115
(a) Average rate of change for Intervals
5 to 11 boxes = [tex]\frac{45 - 18}{11-5}=\frac{27}{6} = \frac{9}{2}[/tex]
= 4.5
11 to 20 boxes = [tex]\frac{99-45}{20-11} = \frac{54}{9}[/tex]
= 6
20 to 25 boxes = [tex]\frac{115-99}{25-20}=\frac{16}{5}[/tex]
= 3.2
(b) for interval of 11 to 20 boxes we have greatest average weight per box.
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