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Math Help - Urn question

  1. #1
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    Urn question

    An urn contains 20 chips, 10 marked H and 10 marked C. Randomly select chips, one at a time, without replacements. After 10 chips have been selected, let X equal the difference between the numbers of H anc C chips that have been selected.
    Define the pmf of X.
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  2. #2
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    Quote Originally Posted by calculuskid1 View Post
    An urn contains 20 chips, 10 marked H and 10 marked C. Randomly select chips, one at a time, without replacements. After 10 chips have been selected, let X equal the difference between the numbers of H anc C chips that have been selected.
    Define the pmf of X.
    How far have you gotten?
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