Question

Class A has 25 pupils and class B has 21 pupils.

Both classes sit the same maths test.
The mean score for class A is 78.
The mean score for class B is 80.
What is the mean score (rounded to 2 DP) in the maths test across both classes?

Please just give the answer no calculations or anything please. Thanks

Answer 1

78.91 ( to 2 dec. places )

I don't like giving an answer without explanation but using the methods used in previous questions you should obtain the above answer