There are three classes A, B, and C having 30, 35 and 40 students respectively. In Class-A the highest score is 19 and lowest score is 15. In Class-B the highest score is 29 and lowest score is 21. In Class-C the highest score 37 and lowest score is 31. Two students are shifted from Class-A to Class-B, two students are shifted from Class-B to Class-C and two students are shifted from Class-C to Class-A.
Consider the following statements:
1. The average score of Class-B will definitely decrease.
2. The average score of Class-C will definitely increase.
3. The average score of Class-A will definitely increase.
1
1 only
2
2 only
3
Both 1 and 2.
4
Both 1 and 3