Sales of tablet computers at Marika Gonzalez's electronics store in Washington, D.C., over the past 10 weeks are shown in the table below: Week 1 2 3 Demand 21 23 27 a) The forecast for weeks 2 through 10 using exponential smoothing with a = 0.55 and a week 1 initial forecast of 21.0 are (round your responses to two decimal places): 1 7 2 21 23 35 Week Demand Forecast 21.0 b) For the forecast developed using exponential smoothing (α = 0.55 and initial forecast 21.0), the MAD = c) For the forecast developed using exponential smoothing (α = 0.55 and initial forecast 21.0), the tracking signal: 3 27 4 37 4 37 6 5 26 30 5 26 6 30 7 8 35 20 8 20 sales (round your response to two decimal places). (round your response to two decimal places). 9 24 9 24 10 30 10 30 U