I also applied to George Mason. I've heard that it's not hard to get an acceptance if and only if you have a really good fit with their research topics and methods. Also, I have been told that their financial help is scarce, so the real acceptance is their funding. Where did you read those rates? My GRE : Verbal - 166, Quantitative-165, AW-3.5, TOEFL:108
Good luck!
(I hope to hear from them soon...)