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Q.

For the following distribution:


Question Image

The modal class is


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a

20-30

b

30-40

c

10-20

d

50-60  

answer is C.

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Detailed Solution

Given that,
Question ImageThen,
Question ImageHere, we see that the highest frequency is 30, which lies in the interval 30-40, and the class with the highest frequency is known as modal class.
Therefore, the modal cass is 30-40.
Hence, the correct option is 3.
 
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