What does B5 stand for?

B5 stands for Blacks and 66.5

This definition appears very frequently

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Samples in periodicals archive:

Non-Hispanic blacks have the highest age-adjusted rates of obesity (47.8%) followed by Hispanics (42.5%), non-Hispanic whites (32.6%), and non-Hispanic Asians (10.8%)

The highest Black student graduation rate at the HBCUs is at Spelman College in Atlanta. There, 79 percent of entering students graduate from Spelman within six years.