This is probably going to sound like a dumb question to those of you that have taken a bunch of these tests... but please be patient, I'm new

I'm taking the intro to soc clep tomorrow, and I've taken the Peterson's practice test. But, what score do I need to pass. I keep seeing things talking about some scaled scores between 20 and 80 and I think I need a 50 to pass. How do I figure out this score?? For example, if I answered 70 questions right in the Peterson's practice test, does that mean it was a passing grade.

Does this even make sense???

Help, please