The page tells you the average speed for connections from your ISP, your region and worldwide, which means it won't necessarily be a good representation of your own experience, but it's an interesting figure nonetheless. There's also a chart showing how that speed has changed over time. Globally, the average speed is 2.9Mbps.
You can only see speed stats for the connection you're currently using — which means, as I'm in the US right now, I can't see how my Australian ISP rates. Tell us how your connection does (and if you think it's acceptable) in the comments.