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Statistics question

2004 · Shift 0 · Q74
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Statistics question

2004 · Shift 0 · Q74

JEE MainMathematicsStatisticsMCQ+4 / −1
In a series of 2n observations, half of them equal aaa and remaining half equal –a–a–a. If the standard deviation of the observations is 2, then ∣a∣|a|∣a∣ equals
  1. A
    2
  2. B
    2\sqrt 22​
  3. C
    1n{1 \over n}n1​
  4. D
    2n{{\sqrt 2 } \over n}n2​​
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