I'd also note that average SAT scores for a given profession tell you very little about the intellectual acheivement of a given individual, and also note that it may be possible that some of the people who are drawn to special ed may be drawn there because they have struggled with learning challenges of their own, some of which can adversely impact performance on standardized performance measures without actually being an indication of lower intelligence, and so this could lower the average of the scores without necessarily indicating that special ed teachers are not as bright as teachers in other specialties.
So, the data have their limitations. But my personal experience with special ed teachers has led me to believe that there is a wide range of abilities represented in that profession, and I'm not entirely surprised that the mean of the profession's SAT curve is below the average for other teachers and for college graduates as a group.
