Question: Jasper's Grocery places an order for Monster every three weeks. Once the order is placed, delivery to the store typically occurs in one week. Average demand is 100 cases per week and the standard deviation of demand is 20 cases per week. The store policy is to stock an amount of inventory that allows for an average stockout condition of 10 percent while waiting for replenishment. It is time to place an order, and there are 420 cases on hand. How many units should be ordered?