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Question

Find out quartile deviation and the coefficient of quartile deviation of the following series.
Wages of 9 workers in Rupees:
170, 82, 110, 100, 150, 150, 200, 116, 250

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Solution

Arranging the data in the ascending order as presented below.
82, 100, 110, 116, 150, 150, 170, 200, 250
Here, N = 9
Q1=size of 9+14th=size of 2.5th item =size of 2nd item+0.5 size of 3rd item-size of 2nd item =100+0.5110-100=105Q3=size of 39+14thitem=size of 7.5th item =size of 7th item+0.5 size of 8th item-size of 7th item =170+0.5200-170=185Q.D.=Q3-Q12=185-1052=40

Coefficient of Q.D.=Q3 - Q1Q3 + Q1=185-105185+105=0.276

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