Question

The variance of 2, 4, 6, 8, 10 is

• A. 8
• B. $\sqrt{8}$
• C. 9
• D. none of these

Answer 1

The correct option is A 8

Given observation is, 2,4,6,8,10.

Here $N=5,\sum x_i=30,\sum x_i^2=220$

$\therefore$ Variance $=\frac{\sum x_i^2}{N}-{\left(\frac{\sum x_i}{N}\right)}^2=8$