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Math Help - need help with probabibility

  1. #1
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    Feb 2010
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    19

    need help with probabibility

    ok so the question is 30% of workers take public transportation. In a sample of 10 workers what is the probability that at least three will take public transportation daily.

    Thanks!!
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  2. #2
    Member
    Joined
    Dec 2009
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    226
    The setting appears to be binomial. Therefore, sum the binomial probability theorem \frac{n!}{k!(n - k)!}p^k(1 - p)^{n - k} (where n is the number of trials, k is the number of successes, and p is the probability of success) for k = 3, k = 4, ..., k = 9, and k = 10, or \sum_{k=3}^{10} \frac{n!}{k!(n - k)!}p^k(1 - p)^{n - k}.
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