3 8 9 1 8 2 10 5 13 6 8 7 12 10 13 12 11 7 6 12 10 The following table shows the actual demand observed over the last 11 years: Year 4 Demand 9 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 5 10 11 12 Forecast 4 6 7 8 9 c) Using the 3-year weighted moving average with weights 0.15.0 35, and 0.50, using 0.50 for the most recent period, provide the forecast from perio Enter your answer in each of the answer boxes. 4 5 6 7 8 9 Year Forecast 10 11 12 c) Using the 3-year weighted moving average with weights 0.15, 0.35, and 0.50, using 0.50 for the most recent period, provide the forecast from periods 4 through your responses to two decimal places). Year 5 7 8 10 11 12 Forecast 4 6 9 d) Mean absolute deviation for the forecast developed using the 3-year moving average is 2.14 and for the 3-year weighted moving average is 2.54. Based on this information, the better forecast is achieved using the approach Enter your answer in each of the answer boxes