Problem 1 Let X = the number of polo shirts purchased during a visit to the men's clothing store. X=x P(X =x) (X- E(X)) ^2 D.3 1.96 0.3 0.16 0.36 AWNHO 0.2 0.1 2.56 0.1 6.76 Find the mean and standard deviation of X. Mean = Standard Deviation = Assuming that each shirt costs $35, let Y be total amount of money (in dollars) spent by a customer when he visits this clothing store. Find the mean and standard deviation of Y. Mean = Standard deviation = Compute the probability that a customer's expenditure will be more than 1 standard deviation above the mean expenditure level