please answer all parts

Book Problem 15-07 (Algorithmic) Refer to the gasoline sales time series data in the given table. Week Sales (1000s of gallons) 17 1 2 21 18 3 24 5 19 6 16 7 22 8 19 9 23 10 20 11 15 12 23 a Compute four-week and five-week moving averages for the time series. Round your answers to two decimal places. 4-Week Moving Average 5-Week Moving Average Week Sales 1 17 2 21 3 18 4 24 5 19 6 16 7 22 8 19 9 23 10 20 11 15 12 23 b. Compute the MSE for the four-week and five-week moving average forecasts. Round your intermediate calculations and final answers to two decimal places MSE for four week moving average - Check My Work 2 more Check My Worses remaining 3 18 LUT 4 24 un 5 19 . 6 16 7 22 B 19 9 23 10 20 11 15 12 23 b. Compute the MSE for the four week and live-week moving average forecasts. Round your intermediate calculations and final arowers to two decimal places. MSE for four-week moving average - MSE for five week moving average c. What appears to be the best number of weeks of past data (three, four or five) to use in the moving average computation? Recal that is for the them a Check My Work 2 ore Check My Working