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[" he mean square deviation of a set of n observations "x_(1),x_(2),...,x_(n)" about point cis defined as "],[sum_(n=1)^(n)sum_((x_(i)-1)^(n)-c_(0))^(2)" The mean square devation about- "2" and "2" are "18" and "10" respectively,then "],[" tandard deviation of this set of of of observations is "],[" Q "3]

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