Yea, I think it's wrong. Another article I read said that 3,814 was the number of early decision and regular decision applicants admitted bringing the acceptance rate down to 18.8%. If we add another 472 to the number, the acceptance rate would be 21%, which is the same number as the acceptance rate for Duke '11 after admissions accepted 100-something people off the waitlist.
Otherwise, Class of 2011 would have a lower acceptance rate than Class of 2012.. if one were to add another 472 there.
It is the Chronicle! What does one expect?
jk of course, Chronicle is awesome!