Colleges' new challenge: Keeping students in school

CNBC reports:

Some 77 percent of full-time students entering college in 2008 earned a degree in six years, compared with just 43 percent of students who attended a mix of part time and 21 percent of entirely part-time students, the study found.

"It still amazes me, the degree to which the recognition of the massive demographic shift in the American student body is an unknown fact for most Americans," said Robert Hansen, chief executive of the University Professional & Continuing Education Association. His organization estimates that just 15 percent of college students today are full-time, first-time students living on campus.

What's amazing is : about just 15% of those in college should be in college.