Can not give you the exact number, but can confidently state, given my experience with juco programs, that the vast majority of juco players that are talented enough to move on to a D1 Power school, were non-qualifiers. That would include 3star and above rated players out of high school. Clearly the ones who move on after only one juco season are qualifiers because if not, they can't. I can also tell you the HC of a higly ranked juco FB program, has told me it is tougher to place his non-qualifiers at B10 schools, than B12 schools.
Per Scout today, the B10 has 244 signees/commits, 12 of which are juco (ave .857 per team). The B12 has 172 signees/commits, 31 of which are juco (ave 3.1 per team). The B12 so far leads all Power-5 conferences in incoming jucos, and its the smallest conference with only 10 teams. The B12 is behind only the MWC and Conf USU in juco concentrations. ISU currently leads the B12 with 6, and only has 16 recruits so far. ISU also has a boatload of jucos returning following Rhoads' last 2 recruiting classes. Iowa has 24 recruits, zero (0) of which are juco.
You can draw your own general conclusions as to whether or not these juco statistics reflect in any way upon which teams/conferences have higher academic standards/models for student athletes. And I'm not aware of any sources which compile statistics for schools that sign dismissed transfers like Hoiberg did. For a broader view of overall academic ratings of Universities, go to U.S News University Academic Ratings. I'll save some of you the effort of a reply - 'F*ck Iowa and F*ck gnarlyboy". Enjoy the bowl season.