I know it it Common App thing but HELP!!!!!!

ido.potter
Sun, 25 Oct 2009 01:42:29 +0000

Hey, in the final report form there are few fields to schools that do not rank their student
We do not rank. Instead, please indicate quartile __________ quintile __________ decile __________

what does it means? quartile ,quintile ,decile

I am among the top 10 student out of a 180 students class
what do I need to write here?