In a series of 2n observations, half of them equal to a and remaining half equal to ?a. If the standard deviation of the observations is 2, then |a| equals [AIEEE 2004]

In a series of 2n observations, half of them equal to a and remaining

1.	In a series of 2n observations, half of them equal to a and remaining half equal to ?a. If the standard deviation of the observations is 2, then \|a\| equals [AIEEE 2004]
A.	\[\frac{\sqrt{2}}{n}\]
B.	\[\sqrt{2}\]
C.	2
D.	\[\frac{1}{n}\]
Answer» D. \[\frac{1}{n}\]

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In a series of 2n observations, half of them equal to a and remaining half equal to ?a. If the standard deviation of the observations is 2, then |a| equals [AIEEE 2004]

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