In a series of \[2n\]observations, half of them equals \['a'\] and remaining equals '__a'. If S.D. is 2, then \[\left| a \right|\] equals

In a series of \[2n\]observations, half of them equals \['a'\] and rem

1.	In a series of \[2n\]observations, half of them equals \['a'\] and remaining equals '__a'. If S.D. is 2, then \[\left\| a \right\|\] equals
A.	\[\frac{1}{n}\]
B.	\[\sqrt{2}\]
C.	\[2\]
D.	\[\frac{\sqrt{2}}{n}\]
Answer» D. \[\frac{\sqrt{2}}{n}\]

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In a series of \[2n\]observations, half of them equals \['a'\] and remaining equals '__a'. If S.D. is 2, then \[\left| a \right|\] equals

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