
20.1% is impossible. Per Wikipedia, 38929319 White Alone is 223,553,265 (72.4%).
Black Alone is 38929319 (12.6%).
Assuming an equal number of male and females Then 20.1% of white females is equal to 14.55% of the female population. That exceed the 12.6% of black male population.
Therefore the percentage of white women married to black men is as follows:
390,000 marriages/(130,547,000.41x72.4% women) = 0.41%
(1) Wikipedia
(2) US Census
(3) Wikipedia
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