If the sum of the squares of deviations for 10 observations taken from their mean is 2.5, then write the value of standard deviation.

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Solution

The sum of the squares of deviations for 10 observations, taken from their mean, is 2.5.
Square of each deviation = $\frac{2.5}{10} = 0.25$
Standard deviation = $\sqrt{0.25} = 0.5$

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