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Math Help - Need Urgent Help!!!!!!!!!

  1. #1
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    Need Urgent Help!!!!!!!!!

    Can anyone help me with the following problem asap:

    There are 9 tennis balls in a box, of which only 5 have not previously been used. Four of the balls are randomly chosen from the box. Let 'z' be the number of new balls among the selected ones:
    (a) Find the probability Distribution of z
    (b) Evaluate the expectation E(z)
    (c) Evaluate the variance Var(z)

    Cheers Guys!!!
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  2. #2
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    Quote Originally Posted by fk36@le.ac.uk View Post
    Can anyone help me with the following problem asap:

    There are 9 tennis balls in a box, of which only 5 have not previously been used. Four of the balls are randomly chosen from the box. Let 'z' be the number of new balls among the selected ones:
    (a) Find the probability Distribution of z
    (b) Evaluate the expectation E(z)
    (c) Evaluate the variance Var(z)

    Cheers Guys!!!
    Read up on the hypergeometric distribution: Hypergeometric distribution - Wikipedia, the free encyclopedia
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