27. In a P system, the lead time for a box of weed-killer is 2 weeks and the review period is 1 week. Demand during the protection interval averages 218 boxes, with a standard deviation of 40 boxes. a. What is the cycle-service level when the target inventory is set at 300 boxes? b. In the fall season, demand for weed-killer decreases but also becomes more highly variable. Assume that during the fall season, demand during the protection interval is expected to decrease to 180 boxes, but with a standard deviation of 50 boxes. What would be the cycle-service level if management keeps the target inventory level set at 300 boxes? Notes: Part a: You are given average demand AND the standard deviation of demand during the Protection Interval (P+L); You are solving for "z" - then determining the service level corresponding to z. Part b: repeat part a process with "revised" values