If the coefficient of variation and variance of a frequency distribution are $7.2$ and $3.24$ respectively,then its mean is
- A$45$
- B$25$
- C$20$
- D$16$
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The variance of the first $50$ even natural numbers is
The coefficient of variation for the frequency distribution is
$x_i$ $4$ $3$ $1$ $f_i$ $1$ $3$ $5$
| $x_i$ | $4$ | $3$ | $1$ |
| $f_i$ | $1$ | $3$ | $5$ |
The variance of the first ten multiples of $3$ is
The mean and standard deviation of $15$ observations are found to be $8$ and $3$ respectively. On rechecking,it was found that,in the observations,$20$ was misread as $5$. Then,the correct variance is equal to......
For a frequency distribution,the standard deviation is computed by applying the formula:
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