A2: 2.6
A4: 2.4
A5: 1.5
A6: 0.900000000000001
A7: 3
A8: 2.7
A9: 2.3
A10: 1.7
A11: 1.9
B2: 220
B3: 280
B4: 250
B5: 170
B6: 150
B7: 340
B8: 310
B9: 210
B10: 180
B11: 190
A3: 2.6
A12 = mean(A2:A11)
B12 = mean(B2:B11)
A: (A2, B2)
B: (A3, B3)
C: (A4, B4)
D: (A5, B5)
E: (A6, B6)
F: (A7, B7)
G_{1}: (A8, B8)
H: (A9, B9)
I: (A10, B10)
J: (A11, B11)
G: (A12, B12)
l1: {A, B, C, D, E, F, G_{1}, H, I, J, G}
f = FitLineY({A, B, C, D, E, F, G_{1}, H, I, J, G})
a: f(4)
g = FitPoly(l1, 3)