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For the following distribution:

The modal class is

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10 - 20

20 - 30

30 - 40

50 - 60

answer is C.

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Detailed Solution

Given that,
Question Image

Then,

Here, 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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