Answer:
b
Step-by-step explanation:
Answer:
c.
Step-by-step explanation:
The answer is 10 (:
Good luck!
Answer: 
Step-by-step explanation:
Given : Sample size : 
Sample mean : 
Standard deviation : 
Significance level : 
Critical value : 
Formula to find the confidence interval for population mean :-

Hence, a 90% confidence interval estimate of the population mean of all students = 
Answer:
18 1/2
Step-by-step explanation:
6 1/6 ÷ 1/3 = 18 1/2