Mathematics
What is the expectation for the \$1 bets on a U.S. roulette wheel?

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I need support with this Statistics question so I can learn better.

What is the expectation for the \$1 bets on a U.S. roulette wheel for three-number bets? Use the figure in this link to answer the question: http://bit.ly/1treZSz

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Let W the  random variable.

P(W=-1) =35/38

P(W=11)=3/38

E(W)=11*3/38-35/38 =-2/38 =-1/19= -0.0526

Boston College
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