B. What should be the target inventory level if the firm desires 97.5 percent stockout protection?

C. If 350 units were in stock at the time of a periodic review, how many units should be ordered?

Nationwide Auto Parts uses a periodic review inventory control system for one of its stock items. The review interval is 4 weeks, and the lead time for receiving the materials ordered from its wholesaler is 2 weeks. Weekly demand is normally distributed, with a mean of 125 units and a standard deviation of 25 units. Refer to the standard normal table for z-values. a. What is the average and the standard deviation of demand during the protection interval? The average demand during the protection interval is units. (Enter your response as an integer.)