| x | 50 | 150 | 250 | 350 | 450 | |
| P(X = x) | .1 | .3 | .2 | .4 | 0 | x.P(X = x) | 5 | 45 | 50 | 140 | 0 |  = Sum = 240 |
| x- |
-190 | -90 | 10 | 110 | 210 | |
| (x- )2 |
(-190)2 = 36100 | (-90)2 = 8100 | 102 = 100 | 1102 = 12100 | 2102 = 44100 |
To get Row 5, we square everything in Row 4:
| x | 50 | 150 | 250 | 350 | 450 | |
| P(X = x) | .1 | .3 | .2 | .4 | 0 | x.P(X = x) | 5 | 45 | 50 | 140 | 0 | = Sum = 240 |
| x- |
-190 | -90 | 10 | 110 | 210 | |
| (x- )2 |
(-190)2 = 36100 | (-90)2 = 8100 | 102 = 100 | 1102 = 12100 | 2102 = 44100 |
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