prosek

1. average; mean
   Plata mu je iznad proseka. — His salary is above average.
   U proseku spavam šest sati noću. — On average I sleep six hours a night.
2. (in school, university) grade point average; average grade
   Završila je fakultet sa prosekom devet i po. — She graduated with an average grade of nine and a half.

Common phrases: u proseku "on average", iznad/ispod proseka "above/below average".