For graduate school at MIT, what is considered a low GPA and what is considered a high GPA?

Colleges and Universities A-Z Massachusetts Institute of Technology
1

Also, how does the prestige of the undergraduate institution factor in?
I currently go to Umich have a 3.5 GPA with a co-authored paper. Am I at all competitive?

2

I think I forgot to mention I was in engineering, so the average GPA is low, I think 3.0 at my school