A1: 60
A2: 70
A3: 80
A4: 90
A5: 100
B1: 8.5
B2: 9.8
B3: 11.7
B4: 13.2
B5: 14.5
ResidualPlot({(60, 8.5), (70, 9.8), (80, 11.7), (90, 13.2), (100, 14.5)}, FitPoly[{(60, 8.5), (70, 9.8), (80, 11.7), (90, 13.2), (100, 14.5)}, 1])