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Math Help - probability

  1. #1
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    probability

    A game.
    3 coins.
    If you roll 3 heads, you get $15.
    If you roll 3 tails, you get $10.
    If you done get either of those things, you lose $5.

    This is what I did...

    15(.125) + 10(.125) - 5(.75)

    Is this right?
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  2. #2
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    Quote Originally Posted by Morgan82 View Post
    A game.
    3 coins.
    If you roll 3 heads, you get $15.
    If you roll 3 tails, you get $10.
    If you done get either of those things, you lose $5.
    15(.125) + 10(.125) - 5(.75)
    Is this right?
    Yes, that is the expected value.
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