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Math help

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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

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