The sum of the squares of deviation of 10 observations from their mean 50 is 250,then coefficient of variation is

Explanation

Given:

`bar X=50`

`n=10`

`(x_i-bar X)^2=250`

Therefore, `sqrt (variance of X) = sqrt frac{sum_(i=1)^(10) (x_i- bar X)^2}{n}=sqrt frac{250}{10}=5`

Using coefficient of variance`= frac{sigma}{X}xx 100`,

`frac{5}{50}xx100=10%`