CAT 1997 — QA Question 5
Change in AverageEasy
Passage / Data
Answer the next 3 questions based on the following information.
There are 60 students in a class. These students are divided into three groups A, B and C of 15, 20 and 25 students each. The groups A and C are combined to form group D.
If one student from group A is shifted to group B, which of the following will be true?
Answer & solution
- A
The average weight of both groups increases
- B
The average weight of both the groups decreases
The average weight of the class remains the same
- D
Cannot be determined
Solution
Although one student is shifted from group A to group B, the number of students in the class and the total weight of the students remain the same. Therefore, the average weight of the class remains the same.