What are my chances of admission to medical school?

I've taken medical-school requirements at George Mason University, and was able to maintain a 4.0 GPA in my courses. In addition to this, I've scored in the 90th percentile on the MCAT. I have a year of research expxerience with the neuroscience & economics research center at George Mason (though no published articles with my name) and 1 year of volunteer experience with the Adult Alzheimer Center at Fairfax, VA. What are my chances of admission to medical school? I was formerly an economics major, and obtained my masters in public policy, and graduated summa and magna *** laude from each of those programs.