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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2004
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Q)
In a series of 2n observations, half of them equal a and remaining half equal -a. If the standard deviation of the observations is 2, then |a| equals
( A ) $\frac{\sqrt{2}}{n}$
( B ) $\sqrt{2}$
( C ) $2$
( D ) $\frac{1}{n}$
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