A researcher interested in language development obtains a sample of 25 three-year-old girls and a sample of 25 three-year-old boys. Each child is given a vocabulary test and the researcher computes the mean score for each sample. The difference between the two sample means is an example of a
a. statistic
b. variable
c. constant
d. parameter

Answers

Answer 1

Answer:

(a) statistic

Step-by-step explanation:

The researcher conducted the research using sample space of 25 three-year-old girls and 25 three-year-old boys. This sample space is subjected to test with an expected outcome. The test allows the research to perform analysis on the event base on data he has collected. The collection, analysis and interpretation of data is called statistics.


Related Questions

Mitch has already spent 26 minutes on the phone, and he expects to spend 2 more minutes with every phone call he routes. Write the relationship between the phone calls routed p and the minutes on the phone t.

Answers

Answer:

minutes spent on phone (t) is directly proportional to the phone calls routed (p)  with equation [tex]t =26+2p[/tex].

Step-by-step explanation:

Given:

Number of minutes already spent = 26 minutes

Number of minutes expected to spend on each call = 2

Let number of calls routed be 'p'

Also Let number of minutes on the phone be 't'.

We need to find the relationship between phone calls routed and mins spend on the phone.

Solution:

Now we know that;

Total minutes spent on phone is equal to Number of minutes already spent plus Number of minutes expected to spend on each call routes multiplied by number of calls routed.

framing in equation form we get;

[tex]t =26+2p[/tex]

From above we can see that whenever p increases the value of t will increase too .

Hence we can say that minutes spent on phone (t) is directly proportional to the phone calls routed (p)  with equation [tex]t =26+2p[/tex].

Sara completes 2/5 of her math homework in class. What percent of homework is left for Sara to finish?

Answers

Answer:

.006%

Step-by-step explanation:

100/5 = 20%. 20(2)= 40%. 100-40 = 60%. Hope this helps! c:

Write an equation for the line that is parallel to y = −2x and passes through the point (0,7).
A. y=2x–7
B. y=-2x + 7
C. y=-2x-7
D. y=2x+7

Answers

Answer:

B. [tex]\displaystyle y = -2x + 7[/tex]

Step-by-step explanation:

The y-intercept is given to us, which is [tex]\displaystyle [0, 7],[/tex]and Parallel Lines have SIMILAR RATE OF CHANGES [SLOPES], so −2 remains the way it is.

I am joyous to assist you anytime.

As you move the pointer over font names in the font list, the text on the slide displays a ____ of the different font choices.

Answers

Answer:

Live preview

Step-by-step explanation:

Live preview

When looking for a font name live preview is the real time view of how a font looks. Software which provides a live preview allows the person to see their font as it would appear if published, updated live as they make changes

Final answer:

Moving the pointer over font names in the font list displays a preview of the different font choices.

Explanation:

As you move the pointer over font names in the font list, the text on the slide displays a preview of the different font choices. This allows you to see how the text will look with different fonts before making a selection. It helps in making a decision based on the visual appearance of the text.

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Megan’s art class painted two regular murals.The size of the first mural is shown below.

Answers

Answer:C) 4 feet and 12 feet

Step-by-step explanation:

The diagram of the first mural is shown. The formula for determining the perimeter of a rectangle is expressed as

Perimeter of rectangle = 2(L + W)

The length of the first mural is given as 8ft while the width of the first mural is given as 6 ft. The perimeter becomes

P = 2(8 + 6) = 2×14 = 28ft

The area of a rectangle is expressed as L×W

The area if the first mural would be

6 × 8 = 48ft^2

The second mural has the same area as the first mural but has a different perimeter. The side lengths of the second mural are

4 ft and 12ft

Area = 4×12 = 48 ft^2

Perimeter = 2(12+4) = 32ft

So area is the same and perimeter is different.

Mark and his three friends are out of Applebee's. Their total is 52.35 If they left the server a 20% tip how much would each person pay splitting the bill evenly

Answers

Answer:

per person$15.71

need help please ty (:
Find x.

Answers

Answer:  x = 18 (choice B)

===================================

Work Shown:

Through the inscribed angle theorem, we can say that 2 times the inscribed angle gets us the arc that the inscribed angle cuts off.

2*(inscribed angle) = arc measure

2*(2x+2) = 76

4x+4 = 76

4x+4-4 = 76-4 ... subtract 4 from both sides

4x = 72

4x/4 = 72/4 ... divide both sides by 4

x = 18

Answer:

Step-by-step explanation:

2 × inscribed angle = 76

2 × (2x + 2) = 76

Open bracket

4x + 4 = 76

Collect like terms

4x = 76 - 4

4x = 72

Divide both sides by 4

4x/4 = 72/4

X = 18

Therefore X is Equal to 18.

JUST ONE MORE I NEED HELP ON HW IM STRUGGLING 15pts
A pilot was scheduled to depart at 4:00 pm, but due to air traffic, her departure has been delayed by 16 minutes. Air traffic control approved a new flight plan that will allow her to arrive four times faster than she calculated in her original flight plan. Let x represent the time, in minutes, of her original flight. Create an equation that can be used to predict the number of minutes after 4:00 pm she will arrive at her destination.

y equals one fourth times x minus 16
y = 4x − 16
y equals one fourth times x plus 16
y = 4x + 16

Answers

Answer:

y equals one fourth times x minus 16

y = 4x − 16

Step-by-step explanation:

this is because you're taking the time it took to get there minus 16 because of the delay

Answer:

Answer is three because it is one fourth of the time don't listen to the other person's.

Step-by-step explanation:

A firm is hiring labor and capital in the cost-minimizing combination. Which of the following would cause the firm to increase hiring capital and decrease hiring of labor?

Answers

The productivity of labor increases by 5% would cause the firm to increase hiring capital and decrease hiring of labor

Step-by-step explanation:

A company can convert input data to output data. So, it gets divided the data into broad categories called production factors. Productivity variations, or more precisely the marginal products of labour, work in the same way as differences in real wages. Remember that marginal prices depend on both - real wages and the productivity.

If in case, productivity increases, perhaps because the company has increased its capital base, thereby marginal costs will decrease. Companies will produce more products and employ more employees. Conversely, if productivity drops, companies will produce less and destroy jobs.

Final answer:

When a firm faces union demands for higher wages, they may increase hiring of capital and decrease hiring of labor. This can result in increased labor productivity. In the United States in the 1970s, firms shifted towards more capital and less labor due to union demands for higher wages.

Explanation:

When a firm is confronted with union demands for higher wages, they may choose to increase hiring of capital and decrease hiring of labor. This is because using more physical capital and less labor can result in increased labor productivity.

For example, if the cost of machines increases relative to labor, the firm may shift towards using less capital and more labor to minimize costs. In this situation, the firm would hire more capital and decrease hiring of labor.

In the United States in the 1970s, this situation occurred where firms faced union demands for higher wages, causing a shift towards more capital and less labor in production methods.

Nour and Rana are shopping for a Christmas tree. They are deciding between 2 different types of trees (real and fake) and 4 colors for the ornaments (white, silver, gold, and purple). They each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments.

Answers

There are no actual questions provided for this post. However, based on the details given, the question will probably asked about the following:

a) list the sample space

b) the probability of having a type of tree with certain color

I will explain to you how to answer such questions. Though it may defer a bit from the actual question, you could use guidance to provide the basis for your answer.

Answer and Step-by-step explanation:

List of sample space must incorporate each sample on two different events given that both events are independent to each other.

In this case we have two events:

i) type of tree - real or fake

ii) color of ornaments - white (W), silver (S), gold (G) or purple (P)

Each sample must have one choices of each events. In this case the sample space are:

(real,W), (real,S), (real,G),(real,P)

(fake,W), (fake,S), (fake,G), (fake,P)

To find probability of any choices, we need to know the probability of each samples. Assuming the selection is random and both events are independent to each other, we can have each sample for each event having different probability.

Event: type of tree

Number of choice: 2

Hence, Pr(real) = Pr(fake) = 1/2

Event: ornament color

Number of choices: 4

Hence, Pr(W) = Pr(S) = Pr(G) = Pr(P) = 1/4

To find the probability of any sample space, we can base our probability using individual probability as above.

For example, if the choice is fake tree with red ornaments

Pr(fake & R) = Pr(fake) x Pr(R)

= 1/2 x 1/4

= 1/8

Answer: Guys the answer is both

Industries pollute because Select one: a. manufacturing consumes energy and produces waste. b. they want to cut costs and increase profits. c. proper waste disposal is too costly. d. All of these are correct.

Answers

Answer:

d

Step-by-step explanation:

Industries Pollute because of following reasons

Lack of Policies and Unplanned industrial growthApplication of obsolete  technologiesInefficient Waste disposal

As the cost of disposal is high so industries dump their waste in the nearby water bodies which causes water pollution. As industries want to maximize their profit so they neglect the disposal part to increase it.

Proper disposal includes the treatment of waste material to reduce its hazardous nature.

               

an automobile 16 feet long overtakes a truck that is 28 feet long and is traveling 30 mph. At what rate must the automobile travel to pass the truck in 4 seconds?

Answers

Automobile must travel at 96 mph to pass the truck in 4 seconds.

Step-by-step explanation:

Length of  automobile = 16 feet = 4.88 m

Length of truck = 28 feet = 8.53 m

Speed of truck = 30 mph = 48 km/h = 13.33 m/s

Time in which automobile to pass truck = 4 s

Distance traveled by truck in 4 seconds = 4 x 13.33 = 53.33 m

Distance which need to cover by automobile in 4 seconds to pass truck is the sum of length of  automobile, length of truck and distance traveled by truck in 4 seconds.

Distance which need to cover by automobile in 4 seconds = 4.88 + 8.53 + 53.33

Distance which need to cover by automobile in 4 seconds = 66.74 m

Distance = Speed x Time

66.74 = Speed x 4

Speed = 16.69 m/s = 60 km/h = 96 mph

Automobile must travel at 96 mph to pass the truck in 4 seconds.

question : The diagram shows a plan for creating a zoo’s elephant exhibit. The elephant pen will be surrounded on two sides by a walkway with a viewing area in one corner. The sides, shown as dotted lines, will be fenced. How much fencing separates the elephant area from the walkways

answer choices :

(A) 180 feet
(B) 250 feet
(C) 540 feet
(D) 750 feet

Answers

Answer:

C

Step-by-step explanation:

We need to find the length of the red dotted line.

It is divided into 3 parts: the top, the middle slant, and the bottom

The top

Goes from y = 50 to y = 120, the length is:

120 - 50 = 70 units

The bottom

Goes from x = 60 to x = 120, the length is:

120 - 60 = 60 units

The middle slant

This is hypotenuse of the right triangle shown.

We will use Pythagorean Theorem to solve for this length, let it be x.

The theorem is:

Leg^2 + Another Leg^2 = x^2

One leg goes from x = 20 to x = 60, the length is 60 - 20 = 40

Another leg goes from y = 20 to y = 50, the lenth is 50 - 20 = 30

So, we have:

[tex]30^2+40^2=x^2\\2500=x^2\\x=\sqrt{2500}\\x=50[/tex]

THe slant length is 50 units

TOtal fencing is:  70 + 60 + 50 = 180 units

1 unit is 3 feet, so

180 units * 3 = 540 feet

C is the correct answer

It takes 2 minutes to print out 3 photos. Write an equation relating the number of photos N to the number of minutes M. At this rate, how long will it take to print 10 photos? 14 photos?

Answers

Answer:

Part a) [tex]M=6\frac{2}{3}\ min[/tex]

Part b) [tex]M=9\frac{1}{3}\ min[/tex]

Step-by-step explanation:

we know that

A relationship between two variables, M, and N, represent a proportional variation if it can be expressed in the form [tex]k=\frac{N}{M}[/tex] or [tex]N=kM[/tex]

In this problem, the relationship between the number of photos N to the number of minutes M represent a proportional variation

we have that

For M=2, N=3

Find the the constant of proportionality k

[tex]k=\frac{N}{M}[/tex]

substitute the value of N and M

[tex]k=\frac{3}{2}[/tex]

so

[tex]N=\frac{3}{2}M[/tex]

Part a) How long will it take to print 10 photos?

For N=10

substitute in the linear equation

[tex]10=\frac{3}{2}M[/tex]

solve for M

[tex]M=\frac{10*2}{3}[/tex]

[tex]M=\frac{20}{3}\ min[/tex]

Convert to mixed number

[tex]M=\frac{20}{3}\ min=\frac{18}{3}+\frac{2}{3}=6\frac{2}{3}\ min[/tex]

Part b) How long will it take to print 14 photos?

For N=14

substitute in the linear equation

[tex]14=\frac{3}{2}M[/tex]

solve for M

[tex]M=\frac{14*2}{3}[/tex]

[tex]M=\frac{28}{3}\ min[/tex]

Convert to mixed number

[tex]M=\frac{28}{3}\ min=\frac{27}{3}+\frac{1}{3}=9\frac{1}{3}\ min[/tex]

math please help! thanks

Answers

Answer:

B

Step-by-step explanation:

For a function to be true, there cannot be any same x value for two different y value. Therefore, B, there is the same x value for 4 but with 2 different ys, 4 and 1.

Answer:

B.

Step-by-step explanation:

It is B because it contains a one-to-many relation.

4 maps to 4 and also 4 maps to 1.

The height of water in a rectangular tank is given by h(w), where w is the volume of water (in liters) that has been removed from the tank. The height of the water decreases 10mm per liter removed.
a. From the time when 7 L have been removed to the time when 15 L have been removed, the accumulated change in the height of the water is
b. If the initial height of the water is 600mm, then the height of the water after w liters have been removed is

Answers

Answer:

a) ΔL = 80mm

b) h = 600 - 10w mm

Step-by-step explanation:

a. From the time when 7 L have been removed to the time when 15 L have been removed, the change in the volume has been 8L and how the height of the water decreases 10mm per liter removed, then the acumulate change in the height of water has been (8lt)(10mm/lt) = 80 mm

b) If w liters have been removed, then the change in the height of water is (10mm/lt)(wlt) = 10w mm and thus the water's height at this precise point in time is 600 - 10w mm

Using the diagram, find the value of x.
←—→–————↗———→
10x
7x-7
←—→–—↙——————→
A. -9
B. 2
C. 8
D. 11

Answers

If you could elaborate on what this is, I would be gladly to assist you, but there is uncertainty going on here. I apologise.

Two roads that cross at right angles are used as coordinate axes for a map. A library is located at point L . Use the drop-down menus to complete the statements about the location of the library.

Answers

The question is incomplete. Here is the complete question:

Two roads that cross at right angles are used as coordinate axes for a map. A library is  located at point L.

Use the drop-down menus to complete the statements about the location of the library.

(a) The library is located at point (_,_).

(b) The library is __  miles from Road X and __  miles from Road Y.

Answer:

(a) The library is located at point (3.25, -1.5).

(b) The library is 1.5 miles from Road X and 3.25 miles from Road Y

Step-by-step explanation:

Given:

The roads are at right angles to each other. Point 'L' is the location of the library.

(a)

From the graph, we can conclude that,

The length of each square in the graph is 0.5 miles. So,

The coordinates of point L are (3.25, -1.5).

The 'x' value is 3.25 and the 'y' value is -1.5.

Since the point 'L' is the location of library, therefore, the library is located at point (3.25,-1.5).

(b)

The distance of point L from road X is obtained by moving vertically up from point L till we reach the road X. In other words, the perpendicular distance between point L and horizontal x axis is the required distance.

The perpendicular distance is the absolute value of the y-coordinate of point L. The absolute value of 'y' of point L is |-1.5| = 1.5 miles.

Hence, the library is 1.5 miles from road X.

Similarly, the distance of point L from road Y is the perpendicular distance of point L to the road Y.

The perpendicular distance is the absolute value of the x-coordinate of point L. The absolute value of 'x' of point L is |3.25| = 3.25 miles.

Therefore, the library is 3.25 miles from road Y.

So, the library is 1.5 miles from Road X and 3.25 miles from Road Y

Madhu is hanging a string of flowers on the perimeter of a rectangular pool deck. The deck is 30 feet long and 24 feet wide. How long does the string of flowers need to be?

Answers

Answer:

108 feet long

Step-by-step explanation:

You know that to find the perimeter you have to add up all the sides. A rectangle has 4 sides, so 30+30 is 60 and 24+24 is 48. Add 60 and 48 up and you get 108 as the perimeter. Since Madhu is hanging a string of flowers on the PERIMETER, the flower string will need to be 108 feet long.

Hope this Helped!

Joe wants to build a doll house for his daughter. He wants the doll house to look just like his house. His house is 28 feet wide and 36 feet tall at the highest point of the roof. If the dollhouse will be 2.5 feet wide, how many feet will its highest point be?

Answers

The highest point for the dollhouse will be 3.12 feet

What is Proportional?

Any relationship that is always in the same ratio and quantity which vary directly with each other is called the proportional.

Given that;

His house is 28 feet wide and 36 feet tall at the highest point of the roof.

And, The dollhouse will be 2.5 feet wide.

Now,

Let the highest point for the dollhouse = x

So, By definition of proportion, we get;

⇒ 28 / 36 = 2.5 / x

Solve for x as;

⇒ x = 2.5 × 36/28

⇒ x = 3.12 feet

Thus, The highest point for the dollhouse = 3.12 feet

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I don’t get this please help ASAP

Answers

Answer:

AE = 70

Step-by-step explanation:

Given that ACE is a triangle and B , D , F are mid-points of AC, CE, AE respectively.

⇒ BF, FD, BD are mid-segments.

Mid-segment is a line segment joining mid points of two sides of a triangle,

And it as two properties :

1) mid-segment is always parallel to the third side

2) mid-segment is half in length of the third side

⇒ Here, BD is the mid-segment and is parallel to third side AE

And also BD is half of AE

⇒ AE = 2×BD = 2×35

AE = 70.    

What is the vertex of the graph of y = -2|x-4|+ 11?
Please show work on how to get the answer. Thanks!

Answers

Answer:

The vertex is the point  [tex](4,11)[/tex]

Step-by-step explanation:

we know that

The equation of the absolute value in vertex form is equal to

[tex]y=a\left|x-h\right|+k[/tex]

where

a is a coefficient      

(h,k) is the vertex

In this problem we have

[tex]y=-2\left|x-4\right|+11[/tex]

so

[tex]a=-2[/tex] ---> the vertex represent a maximum

[tex]h=4[/tex]

[tex]k=11[/tex]

therefore

The vertex is the point  [tex](4,11)[/tex]            

a basketball coach is ordering new basketballs for the upcoming season. Let X be the number ball she can buy. Balls cost $65 and she will buy at least one shopping is a flat fee of $25 she has a budget of $545 that she can spend. Which inequality and solution set best model this situation?

A. 545>25x+65
B. 545>65x+25
C. 545(65+25)x
D. The solution set is all positive integers less than or equal to 6
E. Solution set is all positive integers less than or equal to 8
F. The solution set is all positive integers less than or equal to 19
Select each correct answer

Answers

Answer:

B & E.

Step-by-step explanation:

$25 is the y value, because she has to pay the fee no matter what.

Integers can be less than or equal to 8 because 65(8) + 25 is equal to 545, which does not exceed the budget.

Hope this helps!

Twenty years ago, you began investing $3,000 a year. Because your investments earned an average of 8 percent a year, your investment portfolio has a current dollar value of $92,000. How much did you earn on your investments over the 20-year period of time? a.) $40,000
b.) $132,000
c.) $92,000
d.) $52,000
e.) $2,000

Answers

Answer:

$32,000

Step-by-step explanation:

Yearly investment = $3,000

Number of years = 20

Investments earned an average of 8 percent a year.

Total invested amount = $3,000 × 20 = $60,000

Current value of investment = $92,000.

We need to find the total earnings on the investment.

Earnings = Current value of investment - Total invested amount

Earnings = $92,000 - $60,000

Earnings = $32,000

Therefore, the total earnings is $32,000.

Final answer:

To find out how much was earned on the investments over a 20-year period, we subtract the total amount invested ($60,000) from the final value of the portfolio ($92,000), yielding $32,000 as the total earnings. However, this option is not offered in the question.

Explanation:

This type of question is typically encountered in personal finance or mathematics related to investment portfolios. The total amount invested over twenty years is calculated by multiplying the yearly investment by the number of years, so $3,000 * 20 years = $60,000. This is the amount you've put in from your own pocket. The value of the investment portfolio now is given as $92,000, which is the sum of your investment and the earnings. So to calculate your earnings alone, you subtract the total amount you invested from the current value of your portfolio: $92,000 (total value) - $60,000 (your total investment) = $32,000. So the amount you earned on your investments over this 20-year period is not given in the question as none of the options match our calculation of $32,000.

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help me on this question please

Answers

Answer:

Step-by-step explanation:

The diameter equals the side length of the outer square. The radius of the circle is √2. The diameter of the circle would be

2 × radius = 2 × √2 = 2√2

The area of a square is expressed as length^2. This means that the area of the outer square would be

( 2√2)^2 = 4×2 = 8

The area of the circle is expressed as πr^2. Therefore, the area of the circle would be

π×√2^2 = 2π = 2×3.14 = 6.28

Looking at the inner square, to find the length of the base, we would apply Pythagoras theorem.

√2^2 = base^2 + 1^2

2 = base^2 + 1

base^2 = 2 -1 = 1

base = √1

Area of the inner square would be

√1^2 = 1

Total shaded area would be

6.28 - 1 = 5.28

The probability that the dart will land on the shaded area is

5.28/8 = 0.66

Jess wants to make tarts. To make tarts, she needs 8/9 of a cup of flour per batch of tarts. If Jess has 8 cups of flour, then how many batches of tarts can Jess make?

Answers

Answer:

9 batches of tarts.

Step-by-step explanation:

This is  8 / (8/9)

= 8 * 9/8

= 9 batches of tarts.

The shadow of the moon during a solar eclipse travels 2300 miles in one hour in the first 20 minutes the Shoadow traveled seven 66 2/3 miles how long does it take for the Shadow to reach 1150 miles

Answers

Final answer:

It takes 30 minutes for the moon's shadow to travel 1150 miles during a solar eclipse based on the speed of 2300 miles per hour.

Explanation:

The question asks us to calculate the amount of time it takes the moon's shadow to travel a certain distance during a solar eclipse, based on given speeds and distances. We know that the shadow travels 2300 miles in one hour, so the speed of the shadow is 2300 miles per hour. In the first 20 minutes, the shadow traveled 766 ⅓ miles. To find the time it takes the shadow to reach 1150 miles, we set up a proportion since the motion of the shadow is at a constant speed.

First, let's convert the 20-minute travel time to hours by dividing by 60, which is ⅓ of an hour (20 / 60 = ⅓). Then we can set up the proportion as follows:

766 ⅓ miles is to ⅓ hour, as 1150 miles is to T hours. Which gives us:

(766 ⅓ / 2300) = (⅓ / 1)

(1150 / 2300) = (T / 1)

Now, we solve for T:

⅓ = 1150 / 2300

T = ⅓

So, T is ⅓ of an hour, which means that it takes ⅓ of an hour for the shadow to reach 1150 miles. We can convert ⅓ of an hour to minutes by multiplying by 60, thus:

T = ⅓ × 60

T = 30 minutes

Therefore, it takes 30 minutes for the shadow to reach 1150 miles.

Please I need help

Solve the system by substitution.

{

2

.

5

x



3

y

=



13

3

.

25

x



y

=



14

Answers

Answer:

  (x, y) = (-3 5/8, 1 5/16)

Step-by-step explanation:

Add y+14 to the second equation to get ...

  3.5x +14 = y

Substitute this for y in the first equation:

  2.5x -3(3.5x +14) = -13

  2.5x -10.5x -42 = -13

  -8x = 29

  x = -29/8 = -3 5/8

Using this in the formula for y, we get ...

  3.5(-29/8) +14 = y

  -203/16 +14 = y = 21/16 = 1 5/16

Answer : The value of x and y is, 4 and 27 respectively.

Step-by-step explanation :

The given equations are:

[tex]2.5x-3y=-13[/tex]       ...........(1)

[tex]3.25x-y=-14[/tex]      .........(2)

or,

[tex]y=3.25x+14[/tex]     ..........(3)

Now put equation 3 in 1, we get the value of 'x'.

[tex]2.5x-3y=-13[/tex]

[tex]2.5x-3(3.25x+14)=-13[/tex]

[tex]2.5x-9.75x-42=-13[/tex]

[tex]-7.25x=-13+42[/tex]

[tex]-7.25x=29[/tex]

[tex]x=-\frac{29}{7.25}[/tex]

[tex]x=-4[/tex]

Now put the value of 'x' in equation 3, we get the value of 'y'.

[tex]y=3.25x+14[/tex]

[tex]y=3.25(4)+14[/tex]

[tex]y=13+14[/tex]

[tex]y=27[/tex]

Therefore, the value of x and y is, 4 and 27 respectively.

Sheila predicts that 480 people will attendthe fall concert. There was an actual total of 350 people who attended the fall concert. What is the percent error?

Answers

Final answer:

To calculate the percent error, subtract the actual attendance from the predicted attendance, take the absolute value, divide by the actual attendance, and multiply by 100%. Sheila's prediction has a percent error of 37.14%.

Explanation:

The question is asking for the calculation of the percent error between Sheila's prediction for concert attendance and the actual attendance. To find the percent error, you subtract the actual value from the predicted value, take the absolute value of the difference, divide by the actual value, and then multiply by 100 to convert it to a percentage.

Steps to Calculate Percent Error

Subtract the actual number of attendees (350) from the predicted number (480) to get the difference: 480 - 350 = 130.Take the absolute value of the difference: |130| = 130.Divide the absolute difference by the actual number of attendees: 130 / 350 = 0.3714.Multiply by 100 to get the percent: 0.3714 * 100 = 37.14%.

The percent error in Sheila's prediction is 37.14%.

A pile of newspaper was 17 3/4 inches high. Each consecutive week for the next 5 weeks the height of pile increase by 8 7/12 inches. What is the height in inches, of the pile after 3 weeks?

Answers

Answer: the height in inches, of the pile after 3 weeks is 34 11/12 inches

Step-by-step explanation:

Each consecutive week for the next 5 weeks the height of pile increase by 8 7/12 inches. Converting 8 7/12 inches to improper fraction, it becomes 103/12 inches. The height is increasing in an arithmetic progression. The formula for determining the nth term of an arithmetic sequence is expressed as

Tn = a + (n - 1)d

Where

a represents the first term of the sequence.

d represents the common difference.

n represents the number of terms in the sequence.

From the information given,

a = 17 3/4= 71/4 inches

d = 103/12 inches

n = 3 weeks

the height in inches, of the pile after 3 weeks, T3. Therefore,

T3 = 71/4 + (3 - 1)103/12

T3 = 71/4 + 2 × 103/12 = 71/4 + 103/6

T3 = 419/12 inches = 34 11/12 inches

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