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Your friend has a biased dice, where the probability of rolling an even number is 0.28,...

Your friend has a biased dice, where the probability of rolling an even number is 0.28, and the probability of rolling an odd number is 0.72. Suppose you bet $1 on even. Your friend will pay you $3 if the roll is an even. What is your expected profit (i.e. revenue - cost)?   

Math   Statistics-And-Probability   
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TOPIC:Expectation of random variables.

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