FILL IN THE BLANK. Nationwide Auto Parts uses a periodic review inventory control system for one of its stock items . The review interval is 12 weeks , and the lead time for receiving the materials ordered from its wholesaler is 5 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 2125 units . ( Enter your response as an integer . ) The standard deviation of demand is 103.08 units . ( Enter your response rounded to two decimal places . ) . If the firm desires 96 percent stockout protection , the target inventory level is _____ units . ( Enter your response rounded to the nearest whole number . )