#1**+2 **

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 ]

CPhill Nov 4, 2018

#2**+2 **

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!

ant101 Nov 4, 2018