The mean square deviation of a set \( \mathrm{n} \) observations \( x_{1}, x_{2}, \ldots \ldots ....

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The mean square deviation of a set \( \mathrm{n} \) observations
\( \mathrm{P} \)
\( x_{1}, x_{2}, \ldots \ldots x_{n} \) about a point \( c \) is defined as \( \frac{1}{n} \sum_{i=1}^{n}\left(x_{i}-c\right)^{2} \) The mean square deviation about -2 and 2 are 18 and 10 respectively. Then standard deviation of this set of observation is
(1) 3
(2) 2
(3) 1
(4) None of these
.
(4)(1)(8(18) (9)


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