4) Weekly demand for jeans at a Gap store is normally distributed, with a mean of 90 and a standard deviation of 40. The supply plant takes three weeks to supply a Gap order. The store manager monitors its inventory continuously and reorders jeans when the available inventory drops below 320. How much safety stock does the store carry? What Cycle service level (CSL) does the store achieve? If the store manager wants to target a CSL of 90 percent, how much safety inventory of jeans should the store carry? What should its ROP be