x
2
4
7
8
9
(x‾−x‾\overline{x} - \overline{x}x−x)
-4
-2
1
(x‾−x‾)2\overline{x} - \overline{x})^2x−x)2
16
_________
∑(x−x)2\sum (x - x)^2∑(x−x)2 = 34
x‾= 2+4+7+8+95=6\overline{x} = \; \frac{2 + 4 + 7 + 8 + 9}{5} = 6x=52+4+7+8+9=6
variance = 345\; \frac{34}{5}534
= 6.8
