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Suppose that the manager of a construction supply house determined from historical records that demand for sand averages 54 tons. In addition, suppose the manager determined that demand during lead time could be described by a normal distribution that has a mean of 54 and a standard deviation of 6 tons. Answer the following questions assuming that the manager is willing to accept a stockout risk of no more than 2 percent. Use Table B.2 (Round your answer to two decimal points.) a. What value of z is appropriate? b. How much safety stock should be held? (Round your answer to two decimal points.) c. What reorder point should be used? (Round your answer to two decimal points.)