A hospital records the number of floral deliveries its patients receive each day. For a two-week period, the records show 15, 27, 26, 24, 18, 21, 26, 19, 15, 28, 25, 26, 17, 23 Use a three-period moving average and report the MAE (Mean Absolute Error) for the period of forecasting. Use 2 numbers after the decimal point.