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The modal class of the following frequency distribution is

Class interval Frequency
10 – 20 4
20 – 30 9
30 – 40 12
40 – 50 15
50 – 60 8
60 – 70 2

A) 30 – 40 

B) 40 – 50 

C) 50 – 60 

D) 20- 30

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