Calculate quartile deviation from the data given below.

X

20-30

30-40

40-50

50-60

60-70

F

4

6

8

6

4

X

F

Cumulative Frequency


 

20-30

4

4

30-40

6

10

40-50

8

18

50-60

6

24

60-70

4

28


 



 

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