Standard deviation is calculated from the Harmonic Mean (HM).

Always

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Sometimes

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Never

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None of these

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Solution

The correct option is C Never
Standard deviation is calculated from mean $i . e$ arithmetic mean.
It never be calculated from harmonic mean.

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Similar questions

Marks ( Above)	:	0	10	20	30	40	50	60	70
No. of Students	:	100	90	75	50	25	15	5	0

Calculate mean, variance and standard deviation of the following distribution :

$\begin{matrix} Class : & 1 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 & 50 - 60 Frequency: & 11 & 29 & 18 & 4 & 5 & 3 \end{matrix}$

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