Quote:
|
In 2005 it is believed that 7% of married couples in the US are interracial.[2] In general, the number of Asian and Hispanic marriages and cohabitations are more than whites and blacks.
|
http://en.wikipedia.org/wiki/Interracial_marriage
So less than 1 in 10 are mixed race and even less than that are black/white.
Its not like its all that common, I'm guessing there is a lot of observer bias in assuming they are common since you NOTICE them unlike the other 20 couples that you didn't notice.