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Question Progress
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Exam Paper Progress
15/80
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There are 10 girls and 20 boys in a class.
The class has a test.
The mean mark for all the class is 70
The mean mark for all the boys is 62
Work out the mean mark for the girls.
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6
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U 3 4 5 6

Overview Question Progress 1 2 3 4 Exam Paper Progress 1580 5 There are 10 girls and 20 boys in a class The class has a test The mean mark for all the class is class=


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