Scoring system behind TOEFL®?

[Outofbreath]

I am hoping someone with more familiarity with TOEFL than me can provide a brief explanation.

On what scale is TOEFL graded. That is what is the lowest score possible? Highest?

What constitutes an average (median) score?

[Nukeman]

Well... it depends on what format of TOEFL you are interested in >> Internet based (IBT), Computer (CBT) or Parper(PBT).
The scoring systems are different.
However, you may find these interesting:
IBT>>http://www.mba-center.net/?site=www&section=testprep&page=ibttoefl4
Look troughout the page for more detais

[Outofbreath]

Ahh, thanks for the reply Nukeman.

So for IBT TOEFL the maximum score would be 120 since there are four sections each of which could be graded from 0 to 30.