If `n=10 , X =12 and `sum x^{2}=1530` then the coefficient of variation is 36% (b) 41% (c) 25% (d) none of these

Explanation

`n=10`

`overline{x}=12`

`sum x^{2}=1530`

`sigma=sqrt{frac{sum x^{2}}{n}-(frac{sum x^{2}}{n})^{2}}`

`sigma=sqrt{frac{1530}{10}-12^{2}}`

`sigma=sqrt{9}`

`sigma=3`