If $M.D.$ is $12$, the value of $S.D.$ will be
If $M.D.$ is $12$, the value of $S.D.$ will be
- A
$15$
- B
$12$
- C
$24$
- D
None of these
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If the variance of the frequency distribution is $160$ , then the value of $\mathrm{c} \in \mathrm{N}$ is
$X$
$c$
$2c$
$3c$
$4c$
$5c$
$6c$
$f$
$2$
$1$
$1$
$1$
$1$
$1$
If the variance of the frequency distribution is $160$ , then the value of $\mathrm{c} \in \mathrm{N}$ is
| $X$ | $c$ | $2c$ | $3c$ | $4c$ | $5c$ | $6c$ |
| $f$ | $2$ | $1$ | $1$ | $1$ | $1$ | $1$ |
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The mean and $S.D.$ of the marks of $200$ candidates were found to be $40$ and $15$ respectively. Later, it was discovered that a score of $40$ was wrongly read as $50$. The correct mean and $S.D.$ respectively are...
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If the variance of $10$ natural numbers $1,1,1, \ldots ., 1, k$ is less than $10 ,$ then the maximum possible value of $k$ is ...... .
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The variance of first $50$ even natural numbers is
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