Statistics

A local grocery store wants to estimate the mean number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows that the mean number of gallons sold is 10.00.
A) what is the point estimate of the population mean?
B) compute a 99% confidence interval for the population mean.