2 Week Sales (cases) 1 65 2 64 3 69 62 5 57 6 72 7 61 4 a) [5 points] Compute the forecast values for Weeks 5 - 7 using a 4-period moving average. What is the forecast value for Week 7? Report as a whole number by rounding. 48 b) [3 points] Compute the mean absolute deviation (MAD) for the forecasting method in part a). Report as a whole number by rounding. I c) [4 points] Compute the forecast values for Weeks 5 - 7 using a 4-period weighted moving average with weights 0.2, 0.3, 0.3, 0.2. What is the forecast value for Week 7? Report as a whole number by rounding. d) [3 points] Compute the mean absolute percentage error (MAPE) for the forecasting method in part c). Report as a whole number by rounding %