Answer:
Given:
- There are 29 students.
- Ms. Rochelle wants groups of 6 students each.
What Ms. Rochelle is trying to do is to divide. So, to solve the problem we divide, but this division is not exact.

This means that there will be 4 groups of 6 students each, and one remaining smaller groups of 5 students, that's the meaning of the mixed number.
Therefore, Ms. Rochelle will have 4 groups of 6 students and 1 groups of 5 students, which sum 29 students in total.