>>1
1. Chubby girls have boobs most of the time.
2. Girls of average build are more likely to have average or small boobs, therefore we can exclude them safely.
3. Big is a relatove term, so if one is true than we should look at the fattest cities with the highest women population (I believe it is somewhere in Texas).
There, I cut your work down so much that you can get some decent figures within a month or so... instead of tallying the entire US.