Google cache:http://lukaszielinski.de/2010/10/06/calculate-the-average-sa...
It's a nice little trick.
You could also use my absolutely horrible looking http://average.heroku.com/
It's a nice little trick.
You could also use my absolutely horrible looking http://average.heroku.com/
Let's see how well my attempt goes - Google cache link:
http://webcache.googleusercontent.com/search?q=cache:lukaszi...