5. (4 points) A hospital stocks a "code red" resuscitation kit. The average demand of the kits is 50 kits per working day and the standard deviation of the daily demand is 10 . The lead time is constant at 3 days. The hospital use periodic review policy and review period is set at 9 days. The cycle service level is set at 95%. a. What is the safety stock? b. If the inventory position is at 8 units, what should be the order quantity