5 elevi ------calif. A
4 elevi ------calif. B
3 elevi ------calif. C
3 elevi ------calif. D
5 elevi ------calif. E
_______________
Total elevi=20 elevi
20 elevi ______________100%
15 elevi ______________ x
x=1500/20=75% dintre elevi au obtinut calificative satisfacatoare
