Question

Class A has 8 pupils and class B has 13 pupils.
Both classes sit the same maths test.
The mean score for class A is 38.
The mean score for class B is 53.
What is the mean score (rounded to 2 DP) in the maths test across both classes?
total score / total pupils

[(8 * 38) + (13 * 53)] / (8 + 13)
hard
Too hard
idk what that is but....

Class A has 13 pupils and class B has 12 pupils.
Both classes sit the same maths test.
The mean score for class A is 68.
The mean score for both classes is 45.
What is the mean score (rounded to 2 DP) in the maths test for class B?

= 20.08

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