If you were early, I would cite you different chances than I will now. Early in the game if you have 4 interviews, I would call it highly likely that you will gain an acceptance. At this point, the classes are starting to fill and I have no clue. You are still in good shape, and as long as you are moderately sane with stats on average of the institution you are interviewing, then I would say your chances are pretty decent.
Where are your interviews?