Answer:
A and C
Step-by-step explanation:
<h3>A</h3>

<h3>C</h3>

Answer:
20 total exhibits at the zoo
Step-by-step explanation:
55% of 20 = 11 (monkeys)
Answer: 1692
Step-by-step explanation:
Formula to find the sample size :

Given : Confidence level : 
⇒ significance level =
z-value for 90% confidence interval (using z-table)=
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 :

Simplify , we get

Hence, the required sample size = 1692