Exponential Smoothing. Use Excel Spreadsheet (Copy the table below and Paste it into Excel). The following tabulations are actual sales of units for six months and a starting forecast in January. (F1: initial forecasting value, in this case, Fan=77) Calculate the MAD (Mean Absolute Deviation) for all the forecasts (Include January) (Round your answer to the nearest whole number) January February March April May June Actual 97 93 100 75 79 108 Forecast (ES with alpha=0.4) 77