If in a series which is not highly skewed the mean deviation is 7.8, the approximate value of its standard deviation is

9.75

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8.37

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10.2

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none of these

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Solution

The correct option is A 9.75
We know for moderately skewed distribution,
M.D. $= \frac{4}{5} (S . D)$
$∴ S . D = \frac{5}{4} \times 7.8 = 9.75$

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