There have been a lot of posts this week about queries: request rates, how to write them, how not to write them. I can't see that I would have anything to add, as I didn't get a 75% request rate like this guy. But this girl thinks that's pretty unrealistic, and I agree.
Ignore the numbers (unless they're zero) and write the best damn book you can and an even better query letter. Need some help?
Nathan Bransford - How to Write a Query Letter
Writer Beware - How to Write a Query Letter