So I quickly coded up a little application with LiveCode (http://www.livecode.org). LiveCode comes in a free OpenSource version, so it is great to use with students and schools. The little application is just a virtual flipping of a coin to demonstrate what happens in terms of percentages when a person flips a coin and the outcome of whether it will be heads or tails. The little app is very basic and can be used to foster discussions about coding, probability, and can be used to generate data that can be tracked as the number of times the coin is (virtually) flipped.
You will need LiveCode to open the app project and here is the link to the little app, Coin Flipping App.