上海交通大学试卷（A卷) (2011至2012学年第2学期) 班级号 学号 姓名 课程名称Production and Operations Analysis(生产计划与控制)成绩 1.(10%)Over a one-year period,the Topper Company sold the following numbers of lawn mowers: Week 1 234567891011 12 Sales23822019524534538027022028012011085 a.Compute the three-month moving-average forecast. b.Determine the forecast errors for these periods c.Compute the MAD,the MSE,and the MAPE based on the forecast errors computed in part(b). 2.(10%)A project consists of seven activities.The precedence relationships are given in the table below. Activity Time Immediate (days) Predecessors A 32 B 21 C 30 D 45 A E 26 A,B F 28 C G 20 E,F A卷总6页第1页姓名A 卷 总 6 页 第 1 页 姓名 上 海 交 通 大 学 试 卷（ A 卷） （ 2011 至 2012 学年 第 2 学期 ） 班级号____________ 学号 ______________________ 姓名 课程名称 Production and Operations Analysis (生产计划与控制) 成绩 1. (10%) Over a one-year period, the Topper Company sold the following numbers of lawn mowers: Week 1 2 3 4 5 6 7 8 9 10 11 12 Sales 238 220 195 245 345 380 270 220 280 120 110 85 a. Compute the three-month moving-average forecast. b. Determine the forecast errors for these periods. c. Compute the MAD, the MSE, and the MAPE based on the forecast errors computed in part (b). 2. (10%) A project consists of seven activities. The precedence relationships are given in the table below. Activity Time (days) Immediate Predecessors A B C D E F G 32 21 30 45 26 28 20 _ _ _A A, B C E, F