A third reason: improving the performance of black, Latino and lower-income kids requires particular attention to boys. Black women are nearly twice as likely to earn a college degree as black men. At some historically black colleges, the gap is astounding: Fisk is now 64 female; Howard, 67 percent; Clark Atlanta, 75 percent. The economist Andrew M. Sum and his colleagues at the Center for Labor Market Studies at Northeastern University examined the Boston Public Schools and found that for the graduating class of 2007, there were 191 black girls for every 100 boys going on to attend a four-year college or university. Among Hispanics, the ratio was 175 girls for every 100 boys; among whites, 153 for every 100.