# Math help

posted by
**DeeDee 89** on
.

Could someone work one of these out so I can use as example.

A sample of 59 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25 years. The population variance is 20.

(a) Give a point estimate for ì. (Give your answer correct to one decimal place.)

(b) Find the 95% confidence interval for ì. (Give your answer correct to two decimal places.)

Lower Limit

Upper Limit

(c) Find the 99% confidence interval for ì. (Give your answer correct to two decimal places.)

Lower Limit

Upper Limit