where did i go wrong? please help!

Monthly attendance at financial planning seminars for the past 24 months, and forecasts and errors for those months, are shown in the following table Determine if the forecast is working by computing a tracking signal, beginning with month 10, updating MAD with exponential smoothing Use an alpha value of 0 2. (Round all your calculations to three decimal points.) Month Abend 1 48 2 2 3 Forecast 50 53 51 64 46 5 5 B 52 56 57 51 50 43 39 31 30 36 7 45 51 45 41 27 40 38 57 B S 10 11 12 13 14 15 16 17 -7 5 5 8 6 - 10 3 4 4 -5 Answer is complete but not entirely correct. Cumulative MAD lel Cure Error 2 2 2 1 3 -3 5 8 2 7 15 -5 5 20 0 5 25 5 8 33 3 6 39 9 10 49 -19 3 52 5200 -16 40 11 360 20 4 17 088 16 5 24.070 21 7 32 2563 28 8 39 605 36 5 43.884 41 4 46 507 45 1 48.006 44 1 47.205 43 5 44.764 -38 1 42.011 37 5 39.409 42 7 39 127 49 3 39 902 -52 40 52 65 72 -7 69 77 68 61 18 -3.077 -1.781 -0.936 0.872 X -0.868 X -0.909 -0.934 -0.968 -0.917 -0.911 X 0 849 X -0.881 X -1066 -1 252 1303 61 57 54 44 35 31 29 38 43 -8 5 4 1 1 50 1 19 20 21 53 43 30 30 34 -5 -7 NBN 23 45 46 OOO -3