a) 1+3+4+2=10 elevi cu medii mai mici ca 7
b) 3+4+5+6+7+8+9+10=64:8=8 media clasei
c)10 1
-----------------------------------------------------------
9 2
-----------------------------------------------------------
8 3
------------------------------------------------------------
7 5
------------------------------------------------------------
6 2
------------------------------------------------------------
5 4
------------------------------------------------------------
4 3
------------------------------------------------------------
3 1