The mean square deviation of \( n \) observations \( x_{1}, x_{2}, \ldots . x_{n} \) about \( -2...

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The mean square deviation of \( n \) observations \( x_{1}, x_{2}, \ldots . x_{n} \) about \( -2 \) and 2 are 18 and 10 respectively. Then S.D. of the given set is :
(A) 1
(B) 2
(C) 3
(D) 4
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