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 3Y2. Find the mean, in dollars, and variance of the repair costs.

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck