NDA 2018 Mathematics question

In any discrete series (when all values are not same), if x represents mean deviation about mean and y represents standard deviation, then which one of the following is correct?

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

With , the mean deviation is the mean of the and the standard deviation is the root mean square of the . Since the root mean square is never less than the

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Question ID VK-029050