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In a series of 2n observations, half of...

In a series of `2n` observations, half of them equal `a` end remaining half equal `-a.` If the S.D. of the observationsis `2,` then `|a|` equals (1) `1/n` (2) `sqrt2` (3) `2` (4) `sqrt2/n`

A

`(1)/(n)`

B

` sqrt2`

C

` 2`

D

`(sqrt2)/(n)`

Text Solution

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The correct Answer is:
C
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