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
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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
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