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Mean deviation of 39,40,40,41,41,42, 42, 43,43,44,44,45 from their median is

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1.5

answer is B.

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Detailed Solution

Median $= \frac{42 + 42}{2} = 42 = M$

Mean deviation about median $= \frac{\sum | x_{i} - M |}{n}$

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