You are interested in finding out the average number of sandwiches ordered per customer at Johnnies Munchies and More.

A sample of 32 customer receipts were collected, and the average number of sandwiches ordered were 24. The standard deviation of the population is 6.

Be sure include four decimal places in your answer.

• Build a 95% confidence interval for the population average. Be sure to start your interval with the smaller number first.

• If you want your not to be within 3 (sandwiches) what should your sample size be? Be sure to keep your confidence level at 95 %