A lab orders a number of chemicals from the same supplier every 30 days. The lead time is six days. The assistant manager of the lab must determine how much of one of these chemicals to order. Check of stock reviewed that 12 jars of 25-milliliter (ml) are on hand. Daily usage of the chemical is appropriately normal with a mean of 12.5 ml per day and a standard deviation of 2.4 ml per day. The desired service level for this chemical is 95%. a) How many jars of the chemical should he ordered? b) What is the average amount of safety stock of the chemical.