Calculate mean deviation and its coefficient from median from the following data:

Explanation

Calculation of Mean Deviation from Median

M=Size of `((N)/(2)) th " item"`
=Size of `((50)/(2))th " item"`
=Size of 25th item
20-30 is the median class interval.
`M=l_(1)+(N/(2)-c.f.)/(f)xxi`
`=20+((20)/(2)-13)/(15)xx10=20+(25-13)/(15)xx10`
`=20+(12)/(15)xx10=20+8=28`
Mean Deviation from Median
`MD_(barx)=(sumf|dm|)/(sumf)=(478)/(50)=9.56`
Coefficient of Mean Deviation
`=(MD_(m))/(M)=(9.56)/(28)=0.34`
`MD_(m)=9.56,CMD_(m)=0.34`.