Harvard University economist Richard Murnane's examination of data finds the country's high-school graduation rate, which has been flat for about three decades, is improving. In 2000, estimates show 77.6% of people between ages 20 and 24 had high-school diplomas -- less than the 83.7% he estimates earned a diploma in 2010. Murnane's research shows that the uptick in achievement was particularly sharp among African-American and Latino students, David Wessel writes in this blog post.

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