Based on the following data table, Month (t) 1 2 3 4 5 6 7 8 Demand 55 56 64 60 63 49 61 60 a) According to the above equation, predict demand for months 2 to 9 by using exponential smoothing method with a=0.1 and forecast for first month equal to 50. b) Calculate the MAD of the prediction