Fact Checker here. We have to be very careful when viewing the percentage of candidates that Duke admits.
Duke counts people who did not complete their applications -- for whatever reason you can imagine -- in its pool. The number you see reported as the number who "applied" to Duke is quite different from the number of applications that our admissions Dean and his staff actually had to consider.
Thus the percentage of those admitted also becomes distorted, which is to say lower. I respectfully disagree with administrators in their calculation.