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 4 weeks. Weckly demand is normally distributed, with a mean of 150 units and a standard deviation of 30 units. Refer to the standard normal table for zyalues 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)