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Math Help - probability

  1. #1
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    probability

    find the probability that 7 out of 10 persons will recover from a tropical disease; if the probability that any one will recover from the disease is 0.80.
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  2. #2
    Senior Member
    Joined
    Nov 2008
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    461
    Hello

    It is ( aka binomial distribution)

     \begin{pmatrix} 10 \\ 7 \end{pmatrix} 0.8^7 * 0.2^3

     = \frac{10!}{(10-7)! * 7!} * 0.8^7 * 0.2^3

     = \frac{10*9*8}{3!} * 0.8^7 * 0.2^3 \approx 20.13\%

    Rapha
    Last edited by Rapha; December 9th 2008 at 07:22 AM. Reason: Sorry: TeX Error
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