11.15. Management has stated that it will tolerate one stockout per year. The forecast of annual demand for a particular SKU is 100,000 units, and it is ordered in quantities of 10,000 units. The lead time is 2 weeks. Sales history for the past 10 weeks follows. Calculate: a. Sigma for the demand history time interval. b. Sigma for the lead time interval. c. The service level. d. The safety stock required for this service level. e. The order point.