THK Flight School has three contractor spare parts manufacturing company in Europe: ABC Company supplies 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. (10 pts) b. Should XYZ company accept the offer of the company which is located in Bursa? (15 pts) THK Flight School has three contractor spare parts manufacturing company in Europe: ABC Company supplies 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. (10 pts) b. Should XYZ company accept the offer of the company which is located in Bursa? (15 pts)