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Poisson distribution question

  1. Jan 25, 2005 #1
    ok, so on average, there is a chromosome mutation link once every 10,000 baby births.

    approximate the probability that exactly 3 of the next 20,000 babies born will have the mutation.

    so using poisson distribution, I let
    p = 1/10,000
    n = 20,000.

    and use formula (e^(-np) * (np)^k / k!

    so when I do the calculation, do I sum it all up for k = 1, 2, 3, or do I just calculate k = 3 and that is my final answer?

    if they ask at most 3, then I would sum up k = 1, 2, 3 right?

    I first applied the formula for k = 1, 2, 3, but then it got me thinking about it......
  2. jcsd
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