I'd say typical is something around 20Mbps down, 3Mbps up, but if you look it up you'll find an average quite a bit lower than that because a lot of the US (by land area) can't even get broadband.
The reason is that I live in a rural area about 20-30 miles from major cities. If you go another 10 miles your only option is satellite or dial-up (if you have phone lines to your house).
I'm considering switching to cable, but we will see.