Question

Find the mean deviation about the median of following distribution.

Marks obtained	10	11	12	14	15
No.of students	2	3	8	3	4

Answer 1

Here N = 20, even

∴ Median = 12

Hence, mean deviation about Median (M),

M.D (M) = \(\frac{\sum f_i|x_i-M|}{\sum f_i}\)

= \(\frac{25}{20}\)

= 1.25