5 A large lot of manufactured items contains 10% with exactly one defect, 7% with more than one defect, and the remainder with no defects. Ten items are randomly selected from this lot for sale. If Y₁ denotes the number of items with one defect and Y2, the number with more than one defect, the repair costs are Y₁ + 4Y2. Find the mean, in dollars, and variance of the repair costs. mean variance