The marks obtained by 15 students of a class are given below. Find the modal marks 42,45,47,49,52,65,65,71,71,72,75,82,72,47 ,72

Mode is the number which has highest frequency, that is, largest occurrence.

For ease of observation, we can arrange the data in ascending order. We have,

42, 45, 47, 47, 49, 52, 65, 65, 71, 71, 72, 72, 72, 75, 82

This can be arranged in a tabular form showing frequencies of marks:

The highest frequency is 3, and its corresponding mark is 72.

Thus, modal mark is 72.