I may be wrong a lot with my inferences, but technically it's not paranoia if I am right 51% of the time. OK, so I'm wrong 49% of the time. In college, that would earn me a failing grade. But in life it means I am NOT paranoid, but insightful.
Psychotics -- whether they believe little green men on Mars control the stock market or that their wives are poisoning them -- are not right 51% of the time.
Don't confuse the academic testing situation with real life inferences.