Question

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

• A. $0.75$
• B. $0.4$
• C. $0.5$
• D. $0.7$

Answer 1

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