7.25 A computer magazine has evaluated several popular desktop computers for price and performance. The cost and performance ratings in arbitrary units) are listed below. Plot the cost versus performance in an Excel worksheet. Fit the best possible equation through the data. Unit No. Cost 1 $1280 2 1060 3 1300 4 780 5 1010 Performance 72 86 Unit No. 16 7 8 9 10 Cost $1370 550 800 1000 1040 Performance 112 94 109 113 122 95 ti 89 99 Use the resulting curve fit to estimate the following: (a) How much would you expect to pay for a computer with a performance rating of 105? (b) What performance rating would you expect from a computer that cost $2400? (c) What performance rating would you expect from a computer that cost $1500