math check

The survival rate during a risky operation for patients with no other hope of survival is 87%. What is the probability that exactly four of the next five patients survive this operation? (Give your answer correct to three decimal places.)
I got 3.48

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  1. Incorrect
    p(s) =0.87
    n = 5

    P(x =4)
    P(x) = nCx p^x(1-p)^n-x

    (5C4)(0.87)^4(0.13)^1 = 0.372

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  2. Thank you, I left out a complete step is how I missed it...

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  3. Sorry for the different names, there is a group of us trying to work these out together and using one computer when we have questions...

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  4. No problem

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