Question

The sum of squares of deviations for 10 observations taken from mean 50 is 250. The co-efficient of variation is

• A. 50%
• B. 10%
• C. 40%
• D. None of these

Answer 1

Answer: (B)

10%

Answer 2

$\text{S.D.}(\sigma) = \sqrt{\frac{250}{10}} = \sqrt{25} = 5$

Hence, coefficient of variation$= \frac{\sigma}{\text{mean}} \times 100$

$= \frac{5}{50} \times 100 = 10$%.