Same Problem statement:

Weekly demand for the latest Smart Phone (the whyPhone 4640) at a retailer is normally distributed with a mean of 800 phones and a standard deviation of 200. Currently, the store places orders to the supplier with a reorder point of 3,500 phones. Replenishment lead time is 4 weeks, fixed order cost per order is $100, each phone costs the retailer $200, and the inventory holding cost is 25% per year.

If the retailer wants to achieve a 95% service level (use the z-value with one decimal, as in Table 13.4 of the textbook), what should be the safety stock value?