655  Average
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Class A - 15 students with the score 40%.
Class B - 5 students with the score 70%.
What is the total average score?



Class A - 8 students with the score 70%.
Class B - 2 students with the score 80%.
What is the total average score?



Class A - 4 students with the score 90%.
Class B - 6 students with the score 50%.
What is the total average score?



Class A - 18 students with the score 80%.
Class B - 2 students with the score 80%.
What is the total average score?



Class A - 3 students with the score 80%.
Class B - 7 students with the score 90%.
What is the total average score?



Class A - 8 students with the score 70%.
Class B - 2 students with the score 90%.
What is the total average score?



Class A - 15 students with the score 90%.
Class B - 5 students with the score 70%.
What is the total average score?



Class A - 2 students with the score 70%.
Class B - 8 students with the score 50%.
What is the total average score?



Class A - 14 students with the score 80%.
Class B - 6 students with the score 90%.
What is the total average score?



Class A - 7 students with the score 50%.
Class B - 3 students with the score 40%.
What is the total average score?



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655    47.5 72 66 80 87 ( 352.5 )   74 85 54 83 47 ( 343 )   [[ 695.5 ]]