Bob is a photographer who sells prints on consignment. Each week during the summer, Bob checks the inventory so that he can replenish the prints that have been sold. The following data show the number of prints sold each week during the last eight weeks. Complete parts a through e below. Week Sold 1 15 2 10 3 4 11 16 .... a) Forecast the demand for Week 9 using a two-period simple moving average. 5 6 780 18 14 89 The forecasted demand for Week 9 using a two-period simple moving average is 8.5. (Type an integer or a decimal. Do not round.) b) Calculate the MAD for the forecast in part a. MAD= 4.08 (Round to two decimal places as needed.) c) Forecast the demand for Week 9 using a three-period simple moving average. The forecasted demand for Week 9 using a three-period simple moving average is 10.33. (Round to two decimal places as needed.) d) Calculate the MAD for the forecast in part c. MAD = (Round to two decimal places as needed.)