There aren't that many girls. But.. that certainly has its advantages. You'll find that the lecturers/demonstrators/students all learn your name quite quickly and you are easy to recognise.
As an Electronics undergrad i was the only blonde girl in the course - so everyone knew me. This meant, that in the early weeks, when i was out on nights out guys who i had never spoken to would come up to me and go "oooh are you newDana from EE?". It's great :-)
I went to an all girls high school as well, so it was very nice to hang with guys again. I get on much better with men.
However, if you don't want to be treated like one of the lads, you will probably have to make a conscious effort to stop it (that is, if you get to become friends with your course mates socially). I'm quite happy with being treated as one of the guys - in fact, i prefer it and don't want "special treatment", but be warned.. this does mean you may have to put up with a) farting and b) being the butt of the occasional practical joke.
The only disadvantage i guess is that i have been "friend zoned" by a very large number of men. This would be fine, but in my undergrad i had major crushes on 2 other students, 1 of whom never knew i liked him (definitely friend zoned) and the other who i had a fling with briefly. Right now, i have a massive thing for a fellow student, he knows about it, but we're destined to forever be friends - i quote "but you're far too awesome and amazing to be with a ****wit like me". Sigh. So, i would look outside of your cohort for potential bfs - it can get a bit messy otherwise. Other than that? It's awesome :-)