​ variance

15  8   14    7   6    8    2   8   9    3

The mean is 8

To find the variance...take the average of the squared differences from the mean

So.......we would have

(15 - 8)^2  +  (8 - 8)^2 + ( 7 - 8)^2 + .......+ (3 - 8)^2

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                              10

This ends up being    15. 2   =    [ population variance ]

We can first find the mean, which is 80/10=8.

Now, for each number: subtract the Mean and square the result!

So, (15-8)^2, (8-8)^2, (14-8)^2, (7-8)^2, (6-8)^2, (8-8)^2, (2-8)^2, (8-8)^2, (9-8)^2, (3-8)^2

Which is, 49, 0, 36, 1, 4, 0, 36, 0, 1, 25

Now, find the mean, which is 49+0+36+1+4+0+36+0+1+25/10=15.2!