I know in my college, in my two majors (mechanical engineer & computer science, 2007-2010) it was about 80/20 male/female in ME and 70/30 male/female in CS. The girls average was likely higher than the guys. I don't see how they are "dominating". You're numbers show there are more guys than girls in college - which was also true of my college which overall was 60/40 female/male. That doesn't mean there are more girls in majors related to startups like the ones we are talking about here (which I would highly doubt you can find numbers to say that).