from http://www.tepper.cmu.edu/news-multimed ... px?nid=128
"The new class of students has an average age of 27 and an average GMAT of 691, the highest average score in the school’s history."
The above statement is from 2004 but I can only guess, since it is the case with most schools, that the gmat scores went up. This article also states the average incoming gpa was a 3.3 .
With that given, I would honestly shoot for a higher gmat score to "offset" (if that really happens) your "low" gpa. I would not worry so much though because you are .3 away from the average gpa.
That does not mean that you won't get in with a 3.0 . Several things are considered.