The daily revenue at a university snack bar has been recorded for the past five years. Records indicate that the mean daily revenue is $4750 and the standard deviation is $400. Suppose that 100 days are randomly selected and the average daily revenue computed. Which of the following describes the sampling distribution of the sample mean? Select one: O normally distributed with a mean of $4750 and a standard deviation of $400 normally distributed with a mean of $4750 and a standard deviation of $40 O normally distributed with a mean of $475 and a standard deviation of $40 We don't have enough information to describe the sampling distribution