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Math Help - Expectation

  1. #1
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    Expectation

    hey, I have not done this for a couple years and cannot quite recall how to handle a problem like this.

    An unbiased six-sided die is successively rolled as many times as needed. Let X be the total number of rolls until the first “six” is obtained.

    What is E(X)?

    can someone refresh my memory. I know expectation is just the mean if you did it an infinite number of times, however as close as the answer appears in my mind, I cannot quite recall it.

    Thanks
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  2. #2
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    nevermind, it's just geometric distribution. thanks for reading though.
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Ryan J View Post
    nevermind, it's just geometric distribution.
    ah, good. you found the solution.
    thanks for reading though.
    you're welcome
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