The population mean and standard deviation are given below. Find the required probability and determine whether the given sample mean would be considered unusual. For a sample of n = 75, find the probability of a sample mean being greater than 221 if u = 220 and o = 3.7. For a sample of n = 75, the probability of a sample mean being greater than 221 if u = 220 and o = 3.7 is (Round to four decimal places as needed.) tra