In 2007 a student who turned 24 and came from a family with an income in the top quartile of all family incomes, was almost eight times more likely to have received a Bachelor's degree than a student who came from a family in the bottom quartile of family incomes. Here are the figures by quartile:
Completed Degree
By Age 24 in 2007
Bottom Quartile 9.8% (Less than $39,500)
Second Quartile 18.3% ($39,501 to $68,925)
Third Quartile 33.4% ($68,926 to $116,050)
Top Quartile 75.9% ($116,050 and up)
Source: Postsecondary Education Opportunity, November 2008