158  Average
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Class A - 13 students with the score 50%.
Class B - 7 students with the score 50%.
What is the total average score?



Class A - 17 students with the score 70%.
Class B - 3 students with the score 40%.
What is the total average score?



Class A - 13 students with the score 80%.
Class B - 7 students with the score 80%.
What is the total average score?



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



Class A - 12 students with the score 80%.
Class B - 8 students with the score 40%.
What is the total average score?



Class A - 18 students with the score 70%.
Class B - 2 students with the score 60%.
What is the total average score?



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



Class A - 8 students with the score 70%.
Class B - 2 students with the score 60%.
What is the total average score?



Class A - 13 students with the score 80%.
Class B - 7 students with the score 60%.
What is the total average score?



Class A - 16 students with the score 50%.
Class B - 4 students with the score 60%.
What is the total average score?



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158    50 65.5 80 64 64 ( 323.5 )   69 56 68 73 52 ( 318 )   [[ 641.5 ]]