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2 June, 11:29

A gambler pays $5 to play a game of dice. he rolls two dice. if he rolls a sum of 10 the house pays him $10; if he rolls a sum of 3 the house pays him $20, otherwise he loses. what is the expectation of this game?

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  1. 2 June, 14:58
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    Rolling 2 dice there are 36 possible outcomes.

    Sum of 10: 4, 6; 5, 5; 6, 4

    3 outcomes have a sum of 10.

    Sum of 3: 1, 2; 2, 1

    2 outcomes have a sum of 3.

    Each play costs $5.

    If he rolls a sum of 10, he wins $10, but he paid $5 to play, so for each roll of a sum of 10 he earns $5.

    If he rolls a sum of 3, he wins $20, but he paid $5 to play, so for each roll of a sum of 3 he earns $15.

    For all the other 31 possible sums, he loses $5.

    Add: 3 * $5 + 2 * $15 - 31 * $5 = $110

    Now divide the sum by the total number of outcomes.

    $110/36 = - $3.05555 ...

    Answer: - $3.06
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