There are 24 students in the class. On Friday, the math class is divided into two groups of 12 students. The table shows the results of pupil assessment in 2 groups. Three students in the 1st group had a worse grade than those 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

Correct answer:

p =  2.75

Step-by-step explanation:

s=1 2+2 3+3 6+4 1+5 0=30 n=2+3+6+1+0=12 p1=s/n=30/12=25=221=2.5 p=(s+3)/n=(30+3)/12=2.75

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