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Given \( n \) real numbers \( a_{1}, a_{2}, \ldots a_{n} \), the value of \( x \) for which sum of the square of all the deviations is least is
(a) \( a_{1}+a_{2}+\ldots+a_{n} \)
(b) \( 2\left(a_{1}+a_{2}+\ldots+a_{n}\right) \)
(c) \( a_{1}^{2}+a_{2}^{2}+\ldots+a_{n}^{2} \)
(d) \( \frac{a_{1}+a_{2}+\ldots+a_{n}}{n} \)
W)
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