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Math Help - I need some help with probability

  1. #1
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    Joined
    Feb 2010
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    I need some help with probability

    I missed part of my last stats class and don't understand the homework at all so I was hoping someone here could help me understand it...

    The question is on blood groups and Rh types of 100 subjects and table shows this..

    O A B AB
    Rh+ 39 35 8 4
    Rh- 6 5 2 1

    And the question is:

    If 3 of the 100 subjects are randomly selected, find the probability that they are all group B and type Rh-.

    a) Assume that the selections are made with replacement.
    b) Assume that the selections are made without replacement.

    So I know that with replacement the sample size doesn't change but without replacement it decreases, but that is all i know for setting up this problem.

    I appreciate any help I can get! Thanks!
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  2. #2
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    Apr 2012
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    Minneapolis
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    Re: I need some help with probability

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