only need (error)^2 rounded to 2 decimal places

Problem 15-08 (Algorithmic) Refer again to the gasoline sales time series data in the following table. Week Sales (1000s of gallons) 16 24 20 18 17 E o o ovou AwN 20 16 22 21 25 a. Using a weight of 1/2 for the most recent observation, 1/3 for the second most recent, and 1/6 for third most recent, compute a three-week weighted moving average for the time series. Use rounded for two decimal places values for intermediate calculations. Use minus sign for negative values. Weighted Moving Average Forecast Forecast Error (Error) Week Sales 20.67 3.33 11.11 22.67 -4.67 21.81 20.33 -3.33 11.11 18.5 1.5 2.25 18.67 -2.67 7.13 17.5 4.5 20.25 19.67 1.33 1.77 20.5 -7.5 56.25 17.17 7.83 61.31 Total 192.98