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For each data value, x−x can now be calculated and added to a table. This shows how much each data point varies from the mean.
x | x−x |
---|---|
1 | 1−5=-4 |
5 | 5−5=0 |
3 | 3−5=-2 |
4 | 4−5=-1 |
5 | 5−5=0 |
12 | 12−5=7 |
Square the deviations, and add them to a new column in the table.
x | x−xˉ | (x−xˉ)2 |
---|---|---|
1 | -4 | (-4)2=16 |
5 | 0 | 02=0 |
3 | -2 | (-2)2=4 |
4 | -1 | (-1)2=1 |
5 | 0 | 02=0 |
12 | 7 | 72=49 |
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Round to 2 decimal place(s)