3. A lab uses about 600 test kits each day. The actual number tends to vary. Usage can be approximated by a normal distribution that has a mean of 600 and a standard deviation of 10 test kits per day. A kit supplier delivers kits with a lead time of three days. If the motel policy is to maintain a stockout risk of 5 percent, what is the minimum number of test kits that must be on hand at reorder time, and how much of that amount can be considered safety stock