Aim: put across the idea of using probabilities to decide how much to risk/invest.
You drop a ball from the central slot. You win if you are below the middle (i.e. 6 or below); you lose if you are above the middle (i.e. 8 or above); you get another go if it lands in the middle (i.e. 7).
You start with a 100 credits. You invest some credits before you drop the ball; say x credits. You can’t invest less than 1.
If you win you get your money back and the same again i.e. 2x back.
You have 10 goes.
Your total score is how much you have at the end.