389  Average
1

Name : _________________

refresh

Class A - 2 students with the score 80%.
Class B - 8 students with the score 40%.
What is the total average score?



Class A - 6 students with the score 40%.
Class B - 4 students with the score 80%.
What is the total average score?



Class A - 2 students with the score 50%.
Class B - 8 students with the score 60%.
What is the total average score?



Class A - 16 students with the score 40%.
Class B - 4 students with the score 90%.
What is the total average score?



Class A - 8 students with the score 40%.
Class B - 2 students with the score 40%.
What is the total average score?

Class A - 7 students with the score 90%.
Class B - 3 students with the score 90%.
What is the total average score?



Class A - 3 students with the score 50%.
Class B - 7 students with the score 70%.
What is the total average score?



Class A - 17 students with the score 90%.
Class B - 3 students with the score 40%.
What is the total average score?



Class A - 2 students with the score 40%.
Class B - 8 students with the score 60%.
What is the total average score?



Class A - 5 students with the score 80%.
Class B - 5 students with the score 90%.
What is the total average score?

+(         )

(         )+

++[[          ]]++