6-4	Given this information:
	Average weekly demand = 100 units.
	Standard deviation = 10 units.
	Lead time = 6 weeks.
	Acceptable stockout risk = 2.5%
	Ordering cost = $30
	Annual Holding cost = 20%
	Unit cost (purchase price) = $20
	The company operates = 50 weeks a year.
	Weekly usage rates are distributed normally.
	Determine each of the following, assuming that lead time demand is distributed normally:
	a. Order quantity (EOQ).
	b. The safety stock needed to attain a 2.5 percent risk of stockout during lead time.
	c. The reorder point (ROP) that will provide a risk of stockout of 2.5 percent during lead time.