csatmedium

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?

  1. A.It increases.
  2. B.It decreases.
  3. C.It remains the same.
  4. D.No conclusion can be drawn due to insufficient data.
▶ Answer & Explanation

Correct answer: C. It remains the same.

When students are shifted between groups within the same class, the total number of students and the total weight of all students in the class remain unchanged. Since both the total weight and the total number of students are constant, the overall average weight of the class will not change. The distribution among groups changes, but the class average is unaffected.

Source: UPSC csat 2020

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