This site discussing using tables to represent data.

http://www.shodor.org/interactivate/discussions/pd6.html

You can explore Example 9 by playing with this interactive site called The Monty Hall Dilemma:

http://www.stayorswitch.com/

If you want to play the game a large number of times, you can do so at this site:

http://www.grand-illusions.com/simulator/montysim.htm

There is an introduction to probability at this excellent site:

http://mathforum.org/dr.math/faq/faq.prob.intro.html

Here is an interactive coin-flipping site:

https://www.random.org/coins/

Here is an interactive site for rolling one or more dice.

https://www.random.org/dice/

This site asks the question, “Can you predict what happens next?” It gives a nice introduction to random choices.

http://polymer.bu.edu/java/java/winning/WinningStreak.html