Question

Calculate coefficient of mean deviation about arithmetic mean of the following series

Class - 0-5 5-10 10-15 15-20 20-25

Frequency. 3, 5 ,12,6,4

Answer 1

Answer:

i will hint you

make columns |class| |f| mid value | f.m.v | |x- xmean| | c2×c5 | get a total of c6 .

use formula £f|x-xmean|/£f

coefficient of m.d.= md of xmean/xmean

Explanation:

£f= total of frequency, c5 wil bear +ve values due to modules