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0 votes
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in Mathematics by (31.5k points)

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

(a) 1/n

(b) √2

(c) 2

(d) √2/n

1 Answer

+1 vote
by (61.2k points)
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Best answer

The correct option is (c) 2.

Explanation:

In the 2 n observations, half of them equal to a and remaining half equal to -a. Then, the mean of total 2 n observations is equal to zero.

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