4) Lead Instruments is an authorized distributor for LKB's high voltage power supplies. The weekly demand for high voltage power supplies at Lead Instruments is normally distributed, with a mean of five hundred, and a standard deviation of three hundred. LKB takes four weeks to supply an order to Lead Instruments. The supply chain manager at Lead Instruments is targeting a cycle service level of ninety percent; she monitors the firm's inventory continuously. She wants to calculate the: a) Number of high voltage power supplies to carry as safety inventory. b) Reorder point