In a class, there are three groups A, B and C. If one student from group A and two students from group B are shifted to group C, then what happens to the average weight of the students of the class?

The correct answer is It remains the same.

Step-by-step Explanation:

1. The average weight of all students in a class is given by the formula:

$\text{Average Weight}=\frac{\text{Total Weight of All Students}}{\text{Total Number of Students}}$

2. Shifting students between different groups (from Group A and Group B to Group C) within the same class only changes the internal distribution of students among the groups.

3. The total weight of all the students in the class does not change because no student has entered or left the class.

4. Similarly, the total number of students in the class remains exactly the same.

5. Since neither the total weight of the class nor the total number of students changes, the overall average weight of the students in the class remains the same.