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[" In a series of "2n" observation,half of then "],[" equal a and remaining half equal- "a" .If "],[" the standard deviation of the "],[" observations is "2," then "|a|],[" equals: "],[" (A) "2],[" (B) "sqrt(2)],[" (C) "(1)/(n)],[" (D) "(sqrt(2))/(n)]

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