Stats

Approximately 5% of children develop chronic bronchitis in the first year of life. In a group of 20 children, find the probability that exactly 2 of them develop chronic bronchitis in the first year of life.

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asked by Farah
  1. Formula:

    P(x) = (nCx)(p^x)[q^(n-x)]

    Your data:

    x = 2
    p = .05
    q = 1 - p = 1 - .05 = .95
    n = 20

    Substitute and calculate for your probability.

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    posted by MathGuru

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