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Math Help - Confused on wording

  1. #1
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    Confused on wording

    Among persons donating blood to a clinic, 85% have \text{Rh}^+ blood (that is, the Rhesus factor is present in their blood). Six people donate blood at the clinic on a particular day.

    Find the probability that at least one of the five does not have the Rh factor (confused on how this is worded).
    Plus, there are 6 people donating per day not 5.
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  2. #2
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    You can make p=0.15 for "does not have" the Rh factor and find P(X\geq 1) for n=6, is the 'five' a typo?
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    Quote Originally Posted by pickslides View Post
    You can make p=0.15 for "does not have" the Rh factor and find P(X\geq 1) for n=6, is the 'five' a typo?
    The 5 isn't a typo.
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  4. #4
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    Try the hypergeometric distribution
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