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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asked May 9, 2023 96.1k views

5 votes

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.

Mathematics
college

Rob Mason asked

by Rob Mason

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1 Answer

4 votes

Answer:

the mean mark for girls is 86

Explanation:

62x20+10xX=70*(10+20)

Tim Ludwinski answered May 14, 2023

by Tim Ludwinski

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