need help with 2nd one. also which method is better? this will get upboted if correct! thanks

The following table shows the actual demand observed over the last 11 years: 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). c) Using the 3-year weighted moving average with weights 0.10,0.35, and 0.55 , using 0.55 for the most recent period, provide the fore 12 (round your responses to two decimal places)