Why not just call them up and find out. Doesn't hurt to try does it.
As far as I know, apple doesn't have a written policy about this (or at least, not a public one). Anecdotally, they seem to accept a few dead pixels as part of the normal manufacturing process. I've herad less than three on some occasions, less than 5, and other numbers than that as well. It also makes a difference (again anecdotally) if the pixels are close together or near the center of the screen.
Again though, just call them up and find out.