NUMBER 2 The following questions use the data below. Honest Al's Used Cars wants to predict how many cars are sold each month. He has collected data for 12 months. He needs your help in analyzing this data using moving averages. A 1 4-Month Moving Avg 2 Number of Cars Sold 70 Time Period 1 2 80 4 5 6 66 4 74 5 8 9 64 76 72 82 82 76 10 7 8 9 10 11 12 13 14 11 12 13 14 15 16 17 71.00 70.00 71.50 73.50 78.00 78.00 81.00 84 801 18 MSE 40.59 Refer to Exhibit 11.1. What Excel function will compute the mean squared error in cell C18 of the spreadsheet? a. -SUMXMY2(B7:B14.C7:C14)/COUNT(C7:C14) b. SUMXMY2(B7:B14,C7:C14) c =SUMXMY2(B3:B14.C3:C14)/COUNT(C3:C14) d.=SUMPRODUCT(B7:B14,C7:C14) COUNT(C7:C14)