Well I am guessing that some ideas might be like...
-Choosing random cards from a deck
1. Choose a card to be the probability (king, ace, hearts, etc)
2. Pick out a good amount of cards return when done (maybe around 25 times), make a list of what you choose
3. Count the times you choose that probability card, base the probability by that (fraction, decimal, etc)
I think this is kinda what you need right? Hope it helps...