689  Average
2

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



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



Class A - 6 students with the score 90%.
Class B - 4 students with the score 90%.
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 - 6 students with the score 50%.
Class B - 4 students with the score 40%.
What is the total average score?

Class A - 4 students with the score 80%.
Class B - 6 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 50%.
What is the total average score?



15 紐���� ��⑦�����諛���� ���洹���������� 40 �����닿��,
5 紐���� ��ы�����諛���� ���洹���������� 50 �����쇰��,
��� 諛� ���泥� ���洹� ��������� ��쇰����멸��?



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



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

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