Dentaldoc's opinions are correct. The scores are based on a curve, which is based on how well groupings of people do on the exam. Both the written and computer versions are graded on the curve, although their curves are different (due to different exams), but they will function in the same manner.
Typically, a passing score of 75 correlates to getting 50-60% of the questions in each section correct (or 50-60 out of 100).