A machine produces parts with lengths that are normally distributed with ó = 0.52. A sample of 16 parts has a mean length of 75.07.

(a) Give a point estimate for ì. (Give your answer correct to two decimal places.)
75.07.

(b) Find the 99% confidence maximum error of estimate for ì. (Give your answer correct to three decimal places.0.33 .

(c) Find the 99% confidence interval for ì. (Give your answer correct to three decimal places.)
Lower Limit 74.686 .
Upper Limit 75.453 .