The co-efficient of mean deviation of first five natural numbers is _____.

0.75

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0.4

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0.5

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0.7

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Solution

The correct option is B $0.4$
The first five natural numbers are 1,2,3,4,5
Mean = 3
Mean deviation = 6/5 = 1.2
Coefficient of mean deviation is calculated by dividing the mean deviation of the series by its corresponding average.
Coefficient of mean deviation = Mean deviation / mean
= 1.2 /3
= 0.4

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