Mathematics, 22.07.2019 02:00 googoo4

The mean mark for the class was 70%. there are 30 students in the class, 20 of whom are boys. the mean mark for the boys is 62%. what is the mean mark for the girls?

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The mean mark for the class was 70%. there are 30 students in the class, 20 of whom are boys. the me...

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