Problem 4.2a Question Help C The following table shows the actual demand observed over the last 11 years: Year 1 2 3 4 5 6 7 8 9 10 11 Demand 7 8 4 9 13 9 11 13 8 13 7 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 6 7 8 9 10 11 12 Forecast 6.33 7 8.66 10.33 11 11 10.66 11:33 9.33 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 12 (round your responses to two decimal places). 4 5 6 Year 7 8 9 10 11 12 Forecast