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alisha [4.7K]
3 years ago
12

HELP WITH 20 PLEASE!

Mathematics
1 answer:
agasfer [191]3 years ago
7 0
Divide the circumference by 2, then square that number 
What you are doing is dividing the diameter by 2, getting the radius then squaring which is the formula pi r^2
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Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle mai
Nina [5.8K]

Answer: 1692

Step-by-step explanation:

Formula to find the sample size :

n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2

Given : Confidence level : (1-\alpha)=0.90

⇒ significance level =\alpha= 0.10

z-value for 90% confidence interval (using z-table)=z_{\alpha/2}=1.645

Prior estimate of the population proportion (p) of customers who keep up with regular vehicle maintenance is unknown.

Let we take p= 0.5

Margin of error : E= 2%=0.02

Now, the required sample size will be :

n=0.5(1-0.5)(\dfrac{1.645}{0.02})^2

Simplify , we get

n=(0.25)(6765.0625)=1691.265625\approx1692

Hence, the required sample size = 1692

8 0
3 years ago
Read 2 more answers
Si un gramo de chocolate vale$38.25¿cuánto costarán 750 gramos?
Anna007 [38]

Answer:

28687.5

Step-by-step explanation:

Un gramo equivale a $38,25, por lo que si tenemos 750 de esos gramos, tendríamos que multiplicarlos para obtener el costo total.

3 0
2 years ago
Using the picture below, which angle is alternate exterior to angle 2?
zysi [14]
It’s 7 because it is on the exterior, and the other side, of the the parallel lines from 2.
7 0
2 years ago
The function p(x) is an odd degree polynomial with a negative leading coefficient.
Aliun [14]
A because it’s the right answer
4 0
3 years ago
Sam’s basketball team won 70% of the games they played. How many games did they win?
maw [93]
Assuming it’s out of 100 it would 70 games they have won, but if it provides a number you will need to provide that for the correct answer.
7 0
3 years ago
Read 2 more answers
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