Less Than A Third of Public College Students And About Half Of Private College Students Graduate In Four Years

From The Washington Post, "Public universities pushing ‘super-seniors’ to the graduation stage" by Daniel de Vise:

Fewer than half of students graduate in four years at 33 of the 50 state flagship schools. The overall four-year graduation rate is 31 percent for public colleges and 52 percent for private ones, the federal government reported this year.