# given the following data , find out Quartile deviation and the coefficient of Quartile deviation ??Wage : 0-5 , 5-10, 10-15,15-20,20-25,25-30worker; 4    , 6    ,  3        , 8 ,     12      , 7

Dear Student,

 Class Interval Frequency Cumulative Frequency 0$-$5 4 4 5$-$10 6 10 10$-$15 3 13 15$-$20 8 21 20$-$25 12 33 25$-$30 7 40

First quartile class is given by size of ${\left(\frac{N}{4}\right)}^{\mathrm{th}}$ item, that is, ${\left(\frac{40}{4}\right)}^{\mathrm{th}}$item, which is 10th  item. Thus, 10$-$15 is the first quartile class.

Third quartile class is given by size of
$3{\left(\frac{N}{4}\right)}^{\mathrm{th}}$ item, that is, $3{\left(\frac{40}{4}\right)}^{\mathrm{th}}$item, which is 30th item. Thus, 20$-$25 is the third quartile class.

Coefficient of QD

• 9
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