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Question 145

The quartile deviation of 15, 60, 40, 72, 50, 28 and 30 is

Solution

First of all, arrange the data in ascending order.
15,28,30,40,50,60,72
Quartile Deviation is given by (Q3-Q1)/2 , where

Q1 = (n+1)/4 = 2nd term i.e. 28
Q3 = 3*(n+1)/4 = 6th term i.e. 60

Put the values and answer obtained is 16

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