Sales of tablet computers at Ted Glickman's electronics store in Washington, D.C., over the past 10 weeks are shown in the table below: Week 1 2 3 4 5 6 7 8 9 10 Demand 20 23 29 38 24 29 36 22 26 29 a) The forecast for weeks 2 through 10 using exponential smoothing with a = 0.55 and a week 1 initial forecast of 20.0 are (round your responses to two decimal places) Week 1 2 3 4 5 6 7 8 9 10 Demand 20 23 Forecast 20.0 29 38 24 29 36 22 22 26 29 R b) For the forecast developed using exponential smoothing (x = 0.55 and initial forecast 20.0), the MAD = sales (round your response to two decimal places). c) For the forecast developed using exponential smoothing (a = 0.55 and initial forecast 20.0), the tracking signal = (round your response to two decimal places).