Since the beginning of the year, the purchase manager at a department store has been recording sales data to be used to compute 4-period moving averages to forecast sales for an upcoming month. Sales data for the months of January through September are reported in the table below. Month January February March April May June July August September Sales Computed forecast values are not rounded. 35 32 40 12 15 12 38 44 15 127 V Specify the value as a whole number by rounding. Compute the four-period moving average forecast for October. 27 Compute the mean absolute deviation (MAD) for the four-period moving average forecasts. 11 Compute the mean squared error (MSE) for the four-period moving average forecasts. 141 Compute the mean absolute percentage error (MAPE) for the four-period moving average forecasts. 55 17 Specify the MAD as a whole number by rounding. 295X Specify the MSE as a whole number by rounding. 78 Specify the MAPE as a whole number by rounding.