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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.…

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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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.

asked
User Rob Mason
by
7.9k points

1 Answer

4 votes

Answer:

the mean mark for girls is 86

Explanation:

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

answered
User Tim Ludwinski
by
7.8k points
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