Solve this:
1. Given the following data , Find out quartile deviation and the coefficient of quartile deviation:

 
Wages (Rs) 0-5 5-10 10-15 15-20 20-25 25-30
 Number of Workers 4 6 3 8 12 7


                                                                  (Ans QD = 6.87, Coefficient of QD =0.4)
 

The answer is already given. ​   (Ans QD = 6.87, Coefficient of QD =0.4)

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