Depending on the school you might be able to find aggregate data on it, e.g. they typically pull X% of applicants on hold for interview. Or, you might not be able to find any information on that. No one can answer your question.
I'm pretty sure it's entirely school dependent. I've gotten pretty lucky with my holds so far... For example, I got placed on hold at GW, got an interview invite a few days later, and got accepted last week. I got placed on CCLCM and got an interview invite the next month. But I know a lot of schools where "hold" is not a very positive thing and not many people get invites after getting placed on hold. It really depends.