To get Row 4, we subtract the mean from each value of X:
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- | 50 - 240 = -190 | 150 - 240 = -90 | 250 - 240 = 10 | 350 - 240 = 110 | 450 - 240 = 210 |
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