Question

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?

Answer 1

(13 * 68) + (12 * B) = (13 + 12) * 45