There are 10 boys and 20 girls in a class.
The class has a test.
The mean mark for all...
Mathematics, 24.02.2021 19:00 ashlon98
There are 10 boys and 20 girls in a class.
The class has a test.
The mean mark for all the class is 60.
The mean mark for the girls is 54.
Work out the mean mark for the boys.
Answers: 3
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