expected return per play
... (20 * 12/30) + (10 * 8/30) - (30 * 10/30)
In the same carnival there is a similar game of chance. The game involves a small bag containing 30 marbles where 12 are green and 8 are yellow and the rest are brown. You win 20 pesos if you are able to draw green marble and you win 10 pesos if you are able to draw a yellow marble. You lose 30 pesos if you are able to draw brown ball. H much do you expect to win or lose if you play the game twice?
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