Avon Barksdale's operation uses large quantities of prepaid cell phones, on average 500 per week with a standard deviation of 45. The lead time for their own brand of prepaid cell phones is two weeks and they have a lot size of 125 phones

21) What is the standard deviation of demand during their lead time? A) 45 phones B) 64 phones C) 90 phones D) 109 phones

22) Suppose Mr. Barksdale sets his reorder point at 1100 phones. What is his average cell phone inventory? A) 87.5 phones B) 105 phones C) 162.5 phones D) 257.5 phones

23) What is the average flow time of a phone if the reorder point used by Mr. Barksdale is 2000 phones? A) 1.74 weeks B) 1.87 weeks C) 2.00 weeks D) 2.13 weeks