students at a high school are asked to evaluate their experience in the class at the end of each school year. the courses are evaluated on a 1-4 scale – with 4 being the best experience possible. in the history department, the courses typically are evaluated at 10% 1's, 15% 2's, 34% 3's, and 41% 4's. mr. goodman sets a goal to outscore these numbers. at the end of the year he takes a random sample of his evaluations and finds 10 1's, 13 2's, 48 3's, and 52 4's. at the 0.05 level of significance, can mr. goodman claim that his evaluations are significantly different than the history department's?

The percentage reduction is 40% if the original number was 5 and the new quantity is 3.

A value or ratio that may be stated as a fraction of 100 is referred to as a percentage in mathematics.

If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100.

The proportion therefore refers to a component per hundred. Per 100 is what the word percent means. The letter "%" stands for it.

A percentage is a value expressed as a decimal. Divide the percentage value by 100 to convert percentages to decimals and fractions.

The Latin word per centum, which means "hundred" or "by the hundred," is where the word "percent" originates.

The Italian word per cento, which means "for a hundred," gradually shrank to become the symbol for "percent."

Per was frequently shortened to "p" and eventually vanished entirely. The contemporary "%" symbol was created by condensing the "cento" to two circles divided by a horizontal line.

According to our question-

5 were originally ordered, however only 3 were added, resulting in a net drop of 1.

(5 - 3) = 2.

Now, we'll divide net change by the initial amount and multiply it by 100% to get the percentage change, which is,

(2/5)×100%.

= 40%,

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Answer:

3

Step-by-step explanation:

We know a cube has six sides.

Using this logic, we can divide 54 by 6.

54 ÷ 6 = 9

We can conclude that each side has 9 stickers.

If we think of a square, and the area of that square is 9,

3 × 3 = 9

The number of stickers in each row and column is 3

Answer:

3 stickers in each row and column

Step-by-step explanation:

so i divided 54 by 6 and that equals 9 and since you said there was the same number of stickers on each column and rows that would be 9 separated into a even amount of rows and columns would be 3

Answer:

base = 10

Step-by-step explanation:

For dimensions of x =10 and y=5 for the base and height that will make the tank weight as little as possible.

Here we are given the information of a square-based, open-top, rectangular steel holding tank, so here the tank is in the shape of a cuboid and we know  the formula  for :

volume = x*y*z, as  here it is a square base, so the volume will be

volume =  x²*y, where x and y are the dimension of the base and height

So for the  given reason,  

=>x²*y =  500

=> y = 500/x²

Again, the surface area formula  will be

S=x²+4xy, substituting the value of  y in this question

=>S=x²+4x(500/x²)

=>S=x²+2000/x

Differentiating the above formula with respect to x, we get

=>2x-2000/x²=0

=>2x³= 2000

=>x³= 1000

=>x =10

so the substituting the x values of x in  the equation y , we get

y = 500/x²

=>y = 5

so the dimensions are x= 10 and y=5

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30 inches many carpet tiles will Aurelio need to buy at the very least to cover this portion of the floor in his living room.

Given that,

To cover an area of his living room floor that is 8 1/3 feet wide by 10 feet long, Aurelio is buying carpet tiles. The dimensions of each carpet tile are 20 inches broad by 20 inches long.

We have to find how many carpet tiles will Aurelio need to buy at the very least to cover this portion of the floor in his living room.

We know that,

1 feet=12 inches.

So,

8 1/3 feet = 25/3 feet =100 inches.

10 feet =120 inches.

=100+120 inches

=12000 inches.

So, now

20×20=400

We get

12000/400= 30

Therefore, 30 many carpet tiles will Aurelio need to buy at the very least to cover this portion of the floor in his living room.

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The range function to add up the series is 15 ,35 ,60 ,90, 125,165,210 ,260

A unit of code with a name is referred to as a function in Python. We utilize functions anytime we need to repeat a process repeatedly without writing the same code.

Given: Series 15, 20, 25, 30,.. 50

Program (Pascal ABC) and Result:

Program:

Var i, Summ : integer;

begin

i : = 15;

Summ : = 15;

While i <= 50 do

begin

WriteIn ( '   ' , Summ)  ;

i : = i + 5 ;

Summ : = Summ + i ;

end ;

end.

Result : 15 ,35 ,60 ,90, 125,165,210 ,260

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The correct answer is (C) since the limitations to depict this real-world problem in inequality are 75 < x < 110 and 0 < y ≤ 50.

The equation-like form of the formula 5x 4 > 2x + 3 has an arrowhead in place of the equals sign. It is an illustration of inequity.

This shows that the left half, 5x 4, is bigger than the right part, 2x + 3.

So, our senior trip will be a group excursion to a beach.

Only when the temperature is between 75 and 110 degrees does the resort permit swimming.

On your excursion, there is space for 50 people.

Let y represent the number of travelers and x represent the temperature.

The temperature ranges from 75 to 110 degrees:

75 < x < 110  

On your excursion, there is space for 50 persons:

0 < y ≤ 50

Therefore, the correct answer is (C) since the limitations to depict this real-world problem in inequality are 75 < x < 110 and 0 < y ≤ 50.

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Complete question:
A class trip to a beach has been planned for your senior trip. The resort only allows swimming when the temperature is between 75 degrees and 110 degrees. There is room for 50 people on your trip. Write the constraints to represent this real-world problem, where x is the temperature and y is the number of people on your trip.

a. 0 < x ≤ 50 and 75 < y < 110

b. x > 75 and y < 110

c. 75 < x < 110 and 0 < y ≤ 50

d. x < 110 and y > 75

The margin of error for the confidence interval (6.5, 6.9) is 0.2 , the correct option is (c) .

In the question ,

it is given that ,

the 95% confidence interval for mean hours slept in the graduate students is (6.5, 6.9) ,

we have to find the margin of error ,

we know that the formula for the margin of error is

= (upper limit of confidence interval - lower limit )/2

From the given interval ,

we see that ,

upper limit of confidence interval = 6.9

lower limit of confidence interval = 6.5

Substituting the above value in margin of error formula ,

we get ,

margin of error = (6.9 - 6.5)/2

= 0.4/2

= 0.2

Therefore , the margin of error is 0.2   .

The given question is incomplete , the complete question is

Suppose that based on a random sample, a 95% confidence interval for the mean hours slept (per day) among graduate students was found to be (6.5, 6.9). What is the margin of error of this confidence interval? responses

(a) 6.7

(b) 0.4

(c) 0.2

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f(2) = g(2) and f(0) = g(0) is representation of f(x) = g(x)

Graph is a mathematical representation of a network and it describes the relationship between lines and points.

the curved red line represents g(x) and the straight blue line represents f(x) .

The important thing here is that the equality of functions f(x)=g(x) is represented as a common function between their curves. So, we just need to find such a common point for both.

f(x) has points (0, 4) and (2, 0).

g(x) has points (0,4) and (2,0).

Notice that both functions have the same y-value for x=0 and x=2, that means f(0)=g(0) and f(2)=g(2)

Hence, f(2) = g(2) and f(0) = g(0) is representation of f(x) = g(x)

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To check whether the true average is 59k or not, A sample mean T-Test needs to be conducted. The true value of 59k is 44k after the test.

In the field of statistics, average means that the ratio of the sum of the numbers of a given set, to the total number of characters in a given set. It is also called as the Arithmetic mean.

It is given that the student center has published the data that the average salary of the college graduates is 59k. Accordingly, the sample of 49 college students were verified and the sample average salary came out to be 44k.

When we analyze the  given question, we find that,

The total number of students were 49,The true average was found to be 59k,and the Sample average is found to be 44k.

Thus, in  the present question we will use the One- sample T-test.

We used this test, as the statistical hypothesis test is used to find if the unrecognized population mean is different from the specific value.

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A z-score of 23.9 years must be located in the gorillas' lifespans in a specific zoo's typical normal distribution.

The equation can be used to determine the z score.

z = (x - μ)/σ

In which,

Then,

z = (23.9 - 20.8)/3.1

z = 1

According to the empirical rule, 68% of lifespans are within one standard deviation of the mean.

Half of it, 68/2 = 34% %, is on the right side of the mean's standard deviation.

Given that the likelihood of a gorilla lasting less than 23.9 years is 50%.

A gorilla's lifespan being less than the norm means is;

50% + 34% = 84% sits below z-score 1.

Thus, the probability of a gorilla living less than 23.9 years is 84%.

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The correct question is-

The lifespans of gorillas in a particular zoo are normally distributed. The average gorilla lives 20.8 years; the

standard deviation is 3.1 years.

Use the empirical rule (68 – 95 - 99.7%) to estimate the probability of a gorilla living less than 23.9 years.

Answer:

The answer would be 1240 pounds. The conversion that you would make would be to multiply 0.62 by 2000.

Hope this helps, Have a wonderful day! :D

Step-by-step explanation:

Answer:

I got you!

a ≤ 11

For more info, look at the steps in the attached image!

Step-by-step explanation:

Answer:

a ≥11

Step-by-step explanation:

[tex]21 \geqslant 3a - 21 + 9 \\ 21 \geqslant 3a - 12 \\ 21 + 12 \geqslant 3a - 12 + 12 \\ 33 \geqslant 3a \\ 3a \leqslant 33 \\ a \geqslant 11[/tex]

a) The ratio of tomato plants to lettuce plants:

b) The ratio of lettuce plants to cucumber plants:

To guarantee that at least on pair o the numbers adds up to 9, you must select at least 3 numbers from the set by combination

1. First, select any two numbers from the set.

2. Now, calculate their sum.

3. If the sum of the two numbers is not equal to 9, select a third number from the set.

4. Determine the three numbers' sum.

5. If the sum of the three numbers is still not equal to 9, select a fourth number from the set and calculate the sum.

6. Repeat this process until the sum of the selected numbers is equal to 9 by combination

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Answer:

1. The solution to question one = (2, -6)

2. The solution to question two = (-1, 7)

3. The solution to question three = (1, 12)

4. The solution to question four = (2, -12)

5. The solution to question five = (3, 12)

6. The solution to question six = (-3, 12)

7. The solution to question seven = (-2, -8)

8. The solution to question eight = (-3, 21)

9. The solution to question nine = (2, 16)

Step-by-step explanation:

Steps to solve question 1:

    Step 1: Substitute 5x for y in y = x - 8 and solve for y

         1. (5x) = x - 8 → 4x = 8 → x = 2

    Step 2: Plug 2 in for x in y = x - 8 and solve for x

         2. y = (2) - 8 → y = -6

         The solution to question one: (2, -6)

Steps to solve question 2:

    Step 1: Substitute 3x for y in y = -x - 4 and solve for y

         1. (3x) = -x - 4 → 4x = -4 → x = -1

    Step 2: Plug -1 in for x in y = -x - 4 and solve for x

         2. y = -(-1) - 8 → y = 7

         The solution to question two: (-1, 7)

Steps to solve question 3:

    Step 1: Substitute 12x for y in y = x + 11 and solve for y

         1. (12x) = x + 11 → 11x = 11 → x = 1

    Step 2: Plug 1 in for x in y = x + 11 and solve for x

         2. y = (1) + 11 → y = 12

         The solution to question three: (1, 12)

Steps to solve question 4:

    Step 1: Substitute -6x for y in y = x - 14 and solve for y

         1. (-6x) = x - 14 → -7x = -14 → x = 2

    Step 2: Plug 2 in for x in y = x - 14 and solve for x

         2. y = (2) - 14 → y = -12

         The solution to question four: (2, -12)

Steps to solve question 5:

    Step 1: Substitute 2x for y in y = -x + 9 and solve for y

         1. (2x) = -x + 9 → 3x = 9 → x = 3

    Step 2: Plug 3 in for x in y = -x + 9 and solve for x

         2. y = (3) + 9 → y = 12

         The solution to question five: (3, 12)

Steps to solve question 6:

    Step 1: Substitute -4x for y in y = x + 15 and solve for y

         1. (-4x) = x + 15 → -5x = 15 → x = -3

    Step 2: Plug -3 in for x in y = x + 15 and solve for x

         2. y = (-3) + 15 → y = 12

         The solution to question six: (-3, 12)

Steps to solve question 7:

    Step 1: Substitute 4x for y in y = -x - 10 and solve for y

         1. (4x) = -x - 10 → 5x = -10 → x = -2

    Step 2: Plug -2 in for x in y = -x - 10 and solve for x

         2. y = -(-2) - 10 → y = -8

         The solution to question seven: (-2, -8)

Steps to solve question 8:

    Step 1: Substitute -7x for y in y = x + 24 and solve for y

         1. (-7x) = x + 24 → -8x = 24 → x = -3

    Step 2: Plug -3 in for x in y = x + 24 and solve for x

         2. y = (-3) + 24 → y = 21

         The solution to question eight: (-3, 21)

Steps to solve question 9:

    Step 1: Substitute 8x for y in y = -x + 18 and solve for y

         1. (8x) = -x + 18 → 9x = 18 → x = 2

    Step 2: Plug 2 in for x in y = -x + 18 and solve for x

         2. y = -(2) + 18 → y = 16

         The solution to question nine: (2, 16)

Hope this helps you out :)

Answer:

A = $285.45

A = P + I where

P (principal) = $200.00

I (interest) = $85.45

Step-by-step explanation:

there I hope this helps!

The maximum number of mites in the peach orchard are 1564

Given that,

There are found to be mites in a peach orchard. According to research conducted by the Department of Agriculture, the number of mites t hours after the orchard has been sprayed is roughly represented by the equation N(t)=1600-3tln(0.07t)-t

To find : What is the maximum number of mites in the peach orchard? Round to the nearest whole number.

N(t)=1600-3tln(0.07t)-t

N(19)=1600-3(19)ln(0.07(19))-(19)

N(19)=1600- 16.255 - 19

N(19)=1564.74

N(19)≈1564

Therefore, the maximum number of mites in the peach orchard are 1564

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Abiona should buy the first bicycle ($190) because it is cheaper than the second bicycle ($212.8)

Given that:

The original price of each is $380

The first bicycle is marked down by 50%

The second bicycle is marked down by 30% first and then an additional 20% off

The price of the first bicycle after the discount will be:

price = 380 - (0.5×380)

price = $190

The price of the second bicycle after the discount will be:

After 30% discount:

price = 380 - (0.3×380) = $266

After 20% discount:

price = 266 - (0.2×266) = $212.8

Thus, the price after the discount is $212.8

Therefore, Abiona should buy the first bicycle because it is cheaper

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The probability that at least one customer will report a food allergy is; 0.6323

The formula for Binomial probability distribution is;

P(X = x) = nCx * p^(x) * (1 - p)^(n - x)

Where;

P(X = x) is the probability of getting success.

x is number of trials

n is sample size

p is the probability of getting success in each event.

We are given;

n = 12

p = 0.08

Let x denotes the customer will report a food allergy.

Then, the probability that at least one customer will report a food allergy will be :

P(X ≥ 1) = 1 - P(X < 1)

P(X < 1) IS P(X = 0)

Thus;

P(X ≥ 1) = 1 - 0.3677

P(X ≥ 1) = 0.6323

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Complete question is;

When a customer places an order at Ying Ying's bakery, there is an 8 percent probability that the customer will report a food allergy. One day, 12 customers place orders at Ying Ying's bakery.

Assuming that each of the 12 customers is equally likely to report a food allergy, what is the probability that at least one customer will report a food allergy?

a survey of 1021 school-age children was conducted by randomly selecting children from several large urban elementary schools The U.S. Population Census is an example of a census

Census means the procedure of counting, calculating and recording the number and information about the members of the nation's.

Generally, population census are conducted every 10 years although some nations conduct their's every 5 years.

The primary objective of population census is to know the total size of the population of a country.

Population census also enable the government to appropriate resources fairly based on the number of people in a geographical area.

In conclusion, the U.S. population census is the only example of census.

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Answer:

k = 14

Step-by-step explanation:

2(k+8) = 44

2*k + 2*8 = 44

2k + 16= 44

2k = 44 - 16

2k = 28

k = 28/2

k = 14

Check:

2(14+8) = 44

2*22 = 44

The paper's smallest dimensions are height=8.660in and width=17.321in.

In physics and mathematics, the dimension of space is the smallest set of coordinates needed to specify any point within a mathematical space.

A line has a dimension of one because only one coordinate is needed to specify a point on a line, such as a point at 5 on a number.

So, we have:

Area = 150in²

Side margin = 1 in

Top and Bottom Margin = 2 in

To obtain the smallest dimensions, calculate as follows:

The printed material's area is:

Area = l*w

A1 = h*w

A1 should be changed to 150:

150 = h*w

h = 150/w

The complete paper's topic is:

Area = l*w

A2 = (w+2+2)*(H+1+1)

A2 = (w+4)*(H+2)

For H, substitute 150/W:

A2 = (w+4)*(150/w+2)

A2 = w(150/w+2) + 4(150/w+2)

A2 = 150 + 2w + 600w + 8

A2 = 2w = 600/w + 8 + 150

A2 = 2w = 600/w + 158

Calculate a difference with regard to w and set the outcome to 0:

A'2 = 2-600/w²+0

A'2 = 2-600/w²

0 = 2 - 600/w²

2 = 600/w²

2*w² = 600

w² = 600/2

w² = 300

w = 17.321

Remember that:

h = 150/w

h = 150/17.321

h = 8.660

Therefore, the paper's smallest dimensions are height=8.660in and width=17.321in.

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a) The expected return for stocks a and b is 13.56% and 20.02% respectively.

b) The standard deviation for stocks a and b are 8.32% and 32.60%.

a) Expected return = Probability of recession × Return during recession + Probability of normal × Return during normal + Probability of boom × Return during boom

Expected return for stock A = 0.21 × 0.04 + 0.61 × 0.12 + 0.18 × 0.30

The expected return for stock A = 0.1356

The expected return for stock A = 13.56%

Expected return for stock B = 0.21 × (-0.41) + 0.61 × 0.31 + 0.18 × 0.54

The expected return for stock B = 0.2002

The expected return for stock B = 20.02%

b) Standard deviation of stock = √{Probability(Recession) × (Rate during recession - expected rate )² + Probability(Normal)(Rate during normal - expected return)² + Probability(Boom) × (Rate in boom - Expected return)²}

Standard deviation of stock A = √[(0.21 × (0.04-0.1356)² + 0.61 × (0.12 - 0.1356)² + 0.18 × (0.30-0.1356)²)]

The standard deviation of stock A = 0.0832

The standard deviation of stock A = 8.32

Standard deviation of stock B = √(0.21 × (-0.41-0.2002)² + 0.61(0.31 - 0.2002)² + 0.18 × (0.54-0.2002)²)]

The standard deviation of stock B = 0.3260

The standard deviation of stock B = 32.60%

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The final value of the product = 292

According to the given equation -

= (4a2+3b)x(4a2+36)

multiply the whole equation-

= 16a4+144+12a2b+108

as we can see that the values of a and b are given 1 and 2 respectively,

so putting the values of a and b in the equation we get -

= 16(1)4+144+12(1)2(2)+108

= 292

The product of the following equation will be = 292

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The integration by part  is [tex]\frac{x^{3}In x }{3} -\frac{x^{3} }{9} +C[/tex] with indicated choices of u and dv.

The method Integration by Parts is known to be a special method of integration that is often useful. In calculus, definite integrals are referred to as the integral with limits such as upper and lower limits. It is also possible to derive the formula of integration by parts with limits.

Given: ∫ [tex]x^{2} In x dx[/tex] ; [tex]u=In x[/tex] ; [tex]dv=x^{2} dx[/tex]

Consider  [tex]u=In x[/tex] and [tex]dv=x^{2} dx[/tex]

⇒ [tex]u=In x[/tex]             ⇒  [tex]dv=x^{2} dx[/tex]

⇒ [tex]du= \frac{1}{x} dx[/tex]           ⇒ [tex]v=\frac{x^{3} }{3}[/tex]

Now, apply integration by parts to solve the integral

∫ u dv =  uv - ∫ v du

the antiderivative of [tex]x^{n}[/tex][tex]=\frac{x^{n+1} }{n+1}[/tex] and the derivative of In x = [tex]\frac{1}{x}[/tex] .

⇒ ∫ [tex]x^{2} In x dx =[/tex][tex]\frac{x^{3} In x}{3} -\frac{x^{3} }{3} .\frac{1}{x} dx[/tex]

                     = [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{2} }{3} dx[/tex]

                     =  [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{3} }{9} +C[/tex]

Hence, the final integration is   [tex]\frac{x^{3}In x }{3}[/tex] [tex]-\frac{x^{3} }{9} +C[/tex]

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