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 231 if u = 230 and o = 6.1. For a sample of n = 75, the probability of a sample mean being greater than 231 if u = 230 and o = 6.1 is (Round to four decimal places as needed.) Would the given sample mean be considered unusual? The sample mean be considered unusual because it within the range of a usual event, namely within of the mean of the sample means 1 standard deviation 2 standard deviations 3 standard deviations