Refer to the gasoline sales time series data in the given table. click on the datafile logo to reference the data. data fileweek sales (1,000s of gallons)1 172 213 194 235 186 167 208 189 2210 2011 1512 22(a) compute four-week and five-week moving averages for the time series. if required, round your answers to two decimal places. week sales 4 periodmoving average 5 periodmoving average1 17 2 21 3 19 4 23 5 18 6 16 7 20 8 18 9 22 10 20 11 15 12 22 (b) compute the mse for the four-week and five-week moving average forecasts. if required, round your intermediate calculations to four decimal places and round your final answers to three 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? recall that the mse for the three-week moving average is 10.22.- select your answer -3, 4, or 5