Question 318887: A box contains 4 coins: a penny, a nickel, a dime, and a quarter. It costs a dime to reach in and take a coin. What is the expected value of this game?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A box contains 4 coins: a penny, a nickel, a dime, and a quarter. It costs a dime to reach in and take a coin. What is the expected value of this game?
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Random Number Values: -9....-5....0....15....-10
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Corresponding Proba:: 1/4....1/4...1/4..1/4...0
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E(X) = (1/4)(-9-5+0+15) = (1/4)(1) = 0.25 cents
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Cheers,
Stan H.
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