13th October 2010, 8:56 AM
That's somewhat hard to determine, but in general they end up being sequestered away and forgotten in some special home for such people. I don't know how many of them actually end up going through the entire public school system to graduation.
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." ~ Charles Babbage (1791-1871)