Correct Answer: Option B

Explanation

The modal class is the class interval with the highest frequency.

From the table:

 Frequency of 1-10:  2
11 - 20:  7
21 - 30: 10 (highest)
31 - 40: 3
41 - 50: 1

Therefore, the modal class is 21-30.

The upper-class boundary of a class interval is the upper limit, considering the continuous nature of grouped data (typically 0.5 above the stated upper limit if classes are assumed continuous).

For the class 21 - 30, the upper-class boundary is 30.5.

There is an explanation video available below.

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