This is a really comprehensive site about probability.
It starts with a very nice introduction and then you can
go through all the different stages and see how different
things effect probability. I like the fact that they use
everyday things to show us about probability. There are
also parent notes, as well as activities for this that can be
found at the bottom of the screen.
If you click on the link below it will take you to the activity
handout that you can use in your class.
Click below to go to the website.