That's really weird math since you start with engineering college graduates then jump to talking about the entire population. So you're comparing apples to oranges.
Blacks are about 7% - 8% of college graduates with CS degrees each year. So one would assume that if tech companies were hiring US college graduates at an equivalent rate based on graduation rates then most tech companies would look like Apple that has 7%-8% black employees in their workforce.
> Blacks are about 7% - 8% of college graduates with CS degrees each year
Your data lumps together "Computer sciences," which probably includes Information degrees. If you look at CS degrees only it's about 2.5% in 2015 (https://news.ycombinator.com/item?id=12101868).
Here's something simple. Go look at the metrics for demographics of college majors by degree at http://www.nsf.gov/statistics/seind12/c2/c2s2.htm
Blacks are about 7% - 8% of college graduates with CS degrees each year. So one would assume that if tech companies were hiring US college graduates at an equivalent rate based on graduation rates then most tech companies would look like Apple that has 7%-8% black employees in their workforce.