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Question

Given n observations x1, x2 ......xn and their central tendency a,  the mean deviation about a, M.D(a) = 


Correct Answer
A
ni=1|xia|n
Your Answer
B
ni=1xian
Your Answer
C
ni=1xia

Solution

The correct option is A ni=1|xia|n

Absolute deviations of observations about a will be

| x1 - a || x2 - a || x3 - a |....,| xn - a |

Mean of absolute deviations = |x1a|+|x2a|+....+|xna|n

ni=1|xia|n

MD(a) = ni=1|xia|n

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