For a given distribution of marks mean is $35.16$ and its standard deviation is $19.76$. The co-efficient of variation is..
$\frac{{35.16}}{{19.76}}$
$\frac{{19.76}}{{35.16}}$
$\frac{{35.16}}{{19.76}} \times 100$
$\frac{{19.76}}{{35.16}} \times 100$
The variance of first $50$ even natural numbers is
The mean and standard deviation of $20$ observations are found to be $10$ and $2$, respectively. On respectively, it was found that an observation by mistake was taken $8$ instead of $12$ . The correct standard deviation is
The sum of squares of deviations for $10$ observations taken from mean $50$ is $250$. The co-efficient of variation is.....$\%$
The frequency distribution:
$\begin{array}{|l|l|l|l|l|l|l|} \hline X & 2 & 3 & 4 & 5 & 6 & 7 \\ f & 4 & 9 & 16 & 14 & 11 & 6 \\ \hline \end{array}$
Find the standard deviation.