7.5 A large lot of manufactured items contains 10% with exactly one defect, 5% with more than one defect, and the remainder with no defects. Ten items are randomly selected from this lot for sale. If Y denotes the number of items with one defect and Y2, the number with more than one defect, the repair costs are Y + 3Y2. Find the mean and variance of the repair costs. Let 4 = 4, + Y. Find P(Y=2). Find P(P >1). 2