Please show your work. No Excel. Thanks!

21. Two different forecasting techniques (FI and F2) were used to forecast demand for cases of bottled water. Actual demand and the two sets of forecasts are as follows:PREDICTED DEMAND Period Demand F1 F2 68 66 66 75 68 68 70 72 70 74 71 72 69 72 74 72 70 76 80 71 78 78 74 80 a. Compute MAD for each set of forecasts. Given your results, which forecast appears to be more accurate? Explain. b. Compute the MSE for each set of forecasts. Given your results, which forecast appears to be more accurate