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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The mean of the numbers $a, b, 8,5,10$ is $6$ and their variance is $6.8$. If $M$ is the mean deviation of the numbers about the mean, then $25\; M$ is equal to
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- [JEE MAIN 2022]
Mean and standard deviation of 100 observations were found to be 40 and 10 , respectively. If at the time of calculation two observations were wrongly taken as 30 and 70 in place of 3 and 27 respectively, find the correct standard deviation.
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