Suppose that Brent Matthews, manager of a Sam’s Club in Chattanooga, Tennessee, wants to estimate the mean number of gallons of milk that are sold during a typical weekday. Brent checks the sales records for a random sample of 16 days and finds the mean number of gallons sold is 150 gallons per day; the sample standard deviation is 12 gallons. With 95% confidence, estimate the mean number of gallons that Brent should stock daily.