There are 24 students in the class. On Friday, the math class is divided into 2 groups of 12 students. The table shows the results of pupil assessment in 2 groups. Three students in the 1st group have a grade worse than the students in the 2nd group, the other students had the same evaluation. What is the arithmetic mean of the grades of all first-group students?

rating number of students
1 2
2 3
3 6
4 1
5 0

Your answer:

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