I think it's more that I totally misinterpreted the data. For some reason I assumed it was the number of students from each group that scored above some thresh

I think it's more that I totally misinterpreted the data. For some reason I assumed it was the number of students from each group that scored above some threshold, rather than the average score of that group. My calculations are completely garbage, and I would withdraw the comment but it looks like I can't at this point.