Total acceptance rates are very tricky, and may hide tremendous discrepancies between the ED/EA rate and the RD rate. The key questions are what pct of the class is being admitted ED/EA and what is the ED/EA rate vs the RD rate.
With many selective colleges picking close to 40-50 pct of their classes now in ED/EA at 15-40 pct admit rates, that often leaves the RD rate in the 5-20 pct rate, for total admit rates around 35 pct Does that mean that safeties necessarily should be schools that pick less than 33 pct of their class in ED/EA?