690  Average
 2

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Class A - 15 students with the score 60%.
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 90%.
What is the total average score?



Class A - 4 students with the score 40%.
Class B - 6 students with the score 60%.
What is the total average score?



Class A - 12 students with the score 90%.
Class B - 8 students with the score 90%.
What is the total average score?



Class A - 4 students with the score 70%.
Class B - 6 students with the score 40%.
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 - 16 students with the score 70%.
Class B - 4 students with the score 90%.
What is the total average score?



3 명인 남학생반의 평균점수는 60 점이고,
7 명인 여학생반의 평균점수는 60 점일때,
두 반 전체 평균 점수는 얼마인가?



Class A - 14 students with the score 90%.
Class B - 6 students with the score 50%.
What is the total average score?



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

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690    62.5 86 52 90 52 ( 342.5 )   64 74 60 78 50 ( 326 )   [[ 668.5 ]]