Question 806336
If a player rolls doubles when she uses two dice, she wins $5. If the person rolls a 3 or 12, she wins $15. The cost to play the game is $3. Find the expectation of the game. 
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Random "winnings":: 5.........15........-3
Probabilities:::::: 6/36......3/36......|..27/36

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E(x) = (6*5 + 3*15 - 27*3)/36 = -6/36 = -16 2/3 cents

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Cheers,
Stan H.
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