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The mean square deviation of a set of n ...

The mean square deviation of a set of n observation `x_(1), x_(2), ..... x_(n)` about a point c is defined as `(1)/(n) sum_(i=1)^(n) (x_(i) -c)^(2)`.
The mean square deviations about – 2 and 2 are 18 and 10 respectively, the standard deviation of this set of observations is

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