I need help with b), c) and d)

The following table shows the actual demand observed over the last 11 years: 1 3 4 7 Year Demand 2 9 5 13 6 7 8 13 9 9 10 13 11 7 6 4 10 12 This exercise contains only parts b, c, and d. b) Using the 3-year moving average, provide the forecast from periods 4 through 12 (round your responses to one decimal place) Year 4 5 6 7 8 9 10 11 12 Forecast c) Using the 3-year weighted moving average with weights 0.20, 0.25, and 0.55, using 0.55 for the most recent period, provide the forecast from periods 4 through 12 (round your responses to two decimal places). Year 4 5 6 7 8 9 10 11 12 Forecast d) Mean absolute deviation for the forecast developed using the 3-year moving average is 2.93 and for the 3-year weighted moving average is 3.43. Based on this information, the better forecast is achieved using the approach 3-year moving average E weighted moving average swer boxes