I was 15 and earned $7.50 doing data entry for Chemical Bank (now Chase). I did a few other data entry jobs for good cash. It was the easiest job in the world, but most dull at the same time. We got to listen to our own walkmen though.
I wouldn't say most were women... there were quite a few guys doing it too.
The most interesting "data entry" jobs are the ones where you take people's messages and send them to their alpha numeric pagers. At least there'd be some variety and you get to talk to people on incoming calls. Some girls actually said I had a sexy voice a couple times.. hahaha... they sounded 14 themselves. But that was easy cash... the job, that is.