Question

Compute the mean deviation about mean from the following data:

Class Interval:	0-5	5-10	10-15	15-20	20-25
Frequency f	3	5	12	6	4

Answer 1

Mean = \(\bar{X}=\frac{390}{30}=13\)

Mean deviation about Mean = \(\frac{\Sigma\,f|D|}{N}=\frac{130}{30}=4.33\)