Three classes give three different Introductory Psychology exams to a sample of 10 first year students. Their scores are listed below.

CLASS A	CLASS B	CLASS C
8	12	9
9	11	10
7	9	7
4	6	5
3	8	5
10	10	4
9	10	9
7	9	8
6	7	3
8	6	6

Calculate the mean for each class