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In a series of 2n observations, half of them equal a and remaining half equal –a. If the standard deviation of observations is 2,

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In a series of 2n observations, half of them equal a and remaining half equal –a. If the standard deviation of observations is 2, then |a| equals

(A)  √2/n

(B)  √2

(C)  2

(D)  1/n

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Correct option (C) 2

Explanation: 

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