Would like some assistance so that I can study please.

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. Use Table 72. How many units should be ordered? [Round up your answer to the nest Iwhole number.) _:| Suppose you are a corporate buyer. One of your suppliers delivers a particular part in 16 days on average, with a standard deviation of 2. The daily usage averages 27 units per day with a standard deviation of 3. Use Table 712. a. What is the standard deviation of demand during lead time? [Round your answer to 2 decimal places.) b. If you use a continuous review policy, how much safety stock would you want on hand to ensure at least 97.5 percent availability of the part while waiting for replenishment? (Round your answer to the nearest whole number.}