X | : | 15 | 18 | 21 | 24 | 27 | 30 | 36 | 39 | 42 | 48 |
Y | : | 25 | 25 | 27 | 27 | 31 | 33 | 35 | 41 | 41 | 45 |
X | Y | (x) |
x2 | (y) |
y2 | xy |
15 | 25 | −15 | 225 | −8 | 64 | 120 |
18 | 25 | −12 | 144 | −8 | 64 | 96 |
21 | 27 | −9 | 81 | −6 | 36 | 54 |
24 | 27 | −6 | 36 | −6 | 36 | 36 |
27 | 31 | −3 | 9 | −2 | 4 | 6 |
30 | 33 | 0 | 0 | 0 | 0 | 0 |
36 | 35 | 6 | 36 | 2 | 4 | 12 |
39 | 41 | 9 | 81 | 8 | 64 | 72 |
42 | 41 | 12 | 144 | 8 | 64 | 96 |
48 | 45 | 18 | 324 | 12 | 144 | 216 |
ƩX = 300 | ƩY =330 | Ʃx2 =1080 | Ʃy2 =480 | Ʃxy =708 |