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3 years ago

It takes 20 minutes for 5 people to paint 5 walls.

1 answer:

5 0

It would take 36 minutes. If you use unit rate, you would take 20min/5people and see how many minutes does it take to paint one wall. Which would be represented by 4min/1person. To find how many minutes it would take for 9 walls, you get 4min/1person to become 9 people for the denominator. Then, whatever you do to the denominator you do to the numerator. So, 4 times 9 is 36. Therefore, making the answer 36minutes/9people.

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A veterinarian wants to know if pit bulls or golden retrievers have a higher incidence of tooth decay at the age of three. The v

BigorU [14]

Answer: B) [-0.0332,0.1332]

Step-by-step explanation: <u>Confidence</u> <u>Interval</u> is an interval where we can be a percentage sure the true mean is.

The confidence interval for a difference in population proportion is calculated following these steps:

First, let's find population proportion for each population:

$p_{1}=\frac{30}{120}=0.25$

$p_{2}=\frac{32}{160}=0.2$

Second, calculate standard deviation for each proportion:

$\sigma_{1}=\sqrt{\frac{0.25(0.75)}{120} } = 0.0395$

$\sigma_{2}=\sqrt{\frac{0.2(0.8)}{160} } = 0.0316$

Now, we calculate standard error for difference:

$SE=\sqrt{\sigma_{1}^{2}+\sigma_{2}^{2}}$

$SE=\sqrt{0.0395^{2}+0.0316^{2}}$

SE = 0.0505

The z-score for a 90% CI is 1.645.

Then, confidence interval is

$p_{1}-p_{2}$ ± z-score.SE

$0.25-0.2$ ± $1.645(0.0505)$

0.05 ± 0.0831

The limits of this interval are:

inferior: 0.05 - 0.0831 = $-0.0332$

superior: 0.05 + 0.0831 = 0.1332

The 90% confidence interval for the difference in the population proportion of pit pulls and golden retrievers is $[-0.0332,0.1332]$ .

8 0

3 years ago

Which property is used in the following expression ? 3 (6 + 5) = 18 + 15

cestrela7 [59]

Distributive Property.

3 0

2 years ago

Read 2 more answers

Can y’all please answer this question

USPshnik [31]

Answer:

The customer will pay $19

Option B is correct.

Step-by-step explanation:

Price of Ham per pound = $5.99

Price of Turkey per pound = $4.99

Price of Roast beef per pound = $6.99

Price of Salami per pound = $2.99

Price of Bologna per pound = $3.99

Customer purchased:

Ham = $\frac{1}{4}$ pound

Turkey = $1\frac{1}{2}=\frac{3}{2}$ pound

Roast beef = 1 pound

Bologna = $\frac{3}{4}$ pound

We will multiply the pound purchased with per pound price and add them to find the total cost.

The customer will pay :

$\frac{1}{4}\times5.99+\frac{3}{2} \times4.99+1\times6.99+\frac{3}{4}\times3.99$

$=1.4975+7.485+6.99+2.9925\\=18.965\\\approx19$

So, the customer will pay $19

Option B is correct.

5 0

2 years ago

2y2 + 26y + 80

Illusion [34]

A or c is the correct answer

3 0

2 years ago

Read 2 more answers

Two ice cream shops in the mall sell sundaes. Let x equal the number of scoops of ice cream. Larry's ice cream shops price is re

Gnesinka [82]

Answer:

The answer is: The two shops never charge the same price for sundaes with the same number of scoops.

Step-by-step explanation:

6 0

3 years ago