a. Weekly sales of ten-grain bread at the local organic food market are in the table below, Based on this data, forecast week 9 using a five-week moving average. (3 Marks) Week 1 2 3 4 5 6 7 8 Sales 415 389 420 382 410 432 405 421 b. Weekly sales of copy paper at Cubicle Suppliers are in the table below. Compute a three-period moving average and a four-period moving average for weeks 5, 6, and 7. (4 Marks) Week 1 2 3 4 5 6 7 Sales 17 21 27 31 19 17 21 (cases) C. A management analyst is using exponential smoothing to predict merchandise returns at an upscale branch of a department store chain. Given an actual number of returns of 154 items in the most recent period completed, a forecast of 172 items for that period, and a smoothing constant of 0.3, what is the forecast for the next period