A machine is setup in such a way that the mean content of juice per bottle is 500 milliliters with a standard deviation of 12 milliliters. a)Give a 93% confidence interval for the mean content of...

A machine is setup in such a way that the mean content of juice per bottle is 500 milliliters with a standard deviation of 12 milliliters.

a)Give a 93% confidence interval for the mean content of juice per bottle.

b) What should be the sample size if the average content should be within 5 milliliters at the 93% confidence level?