1.) How many people do you have to sample to estimate the average age of an American voter to within a margin of error of 5 years? Assume the standard deviation of age of American voters is 16 years.

Group of answer choices

A.) 40

B.) 6

C.) 39

D.) None of the other choices is correct

2.) What would happen to the margin of error if the standard deviation were to decrease?

Group of answer choices

A.) it would stay the same

B.) it would increase

C.) it would decrease

3.) Last year the average age of our clients was 25, and this year we believe it has increased. We took a sample of 49 clients and found the average age of the sample was 30 and the standard deviation of the sample was 10. What is the value of uo in this problem? (That is, mu sub-zero.)

Group of answer choices

A.) 25

B.) unknown

C.) 30