Chapter 12, problem 26. A small copy center uses five 500-sheet boxes of copy paper a week. Experience suggests that usage can be well approximated by a normal distribution with a mean of five boxes per week and a standard deviation of one-half box per week. Two weeks are required to fill an order for letterhead stationery. If the copy center reorders when the supply on hand is 10 boxes, what is the risk of a stockout? 50% O 75% 95% 99%