Suppose that cars arrive Wendy's drive-through at the rate of 40 cars per hour between noon and 1:00 p.m. A random sample of 40 one-hour time periods between noon and 1:00 p.m. is selected and 44.1 is the mean number of cars arriving for this sample. a. Why is the sampling distribution of the sample mean (x) approximately normal? b. What is the mean and standard deviation of the sampling distribution of x assuming that =40 and = 40? c. What is the probability that a simple random sample of 40 one-hour time periods results in a mean of at least 44.1 cars? Is this result unusual? What might we conclude?