please help me complete the incorrect parts accurately

(a) What is the recommended order quantity? (Round your answer to the nearest integer.) reorder point 9 safety stock (c) If a manager sets the reorder point at 30, what is the probability of a stock-out on any given order cycle? (Round your answer to four decimal places.) How many times would you expect a stock-out during the year if this reorder point were used? (Round your answer to the nearest integer.)