please new soluton, not old chegg solutions

THK Flight School has three contractor spare parts manufacturing company in Europe: ABC Company suppnes Q family of spare parts, XYZ Company supplies Z family of spare parts and PRS Company supplies W family of spare parts. XYZ has a supply source in IZMIT that delivers Z1 semi-product for TL200. Weekly demand for Z1 is a normally distributed with a mean of 5000 and a standard deviation of 300 . The lead time required by the supplier is normally distributed with a mean of 4 weeks and a standard deviation of 2 weeks. Another company in Bursa has offered to deliver Z1s with a lead time of one week at a cost of TL 220. XYZ has a holding cost of 18 percent and targets a "cycle service level of 95 percent". a. Calculate the "demand uncertainty of the XYZ company for semi-product Z1". Comment on the result. b. Should XYZ company accept the offer of the company which is located in Bursa