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Math Help - complement rule

  1. #1
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    complement rule

    In the past year, 26% of businesses in Oregon have eliminated jobs. If seven businesses in Oregon are randomly selected, what is the probability that no more than four of the slected businesses have eliminated jobs?
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  2. #2
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    That looks rather Binomial to me.

    p = 0.26 = Pr(finding a job loser)

    q = 1 - 0.26 = 0.74 = Pr(Finding a non-loser of jobs)

    n = 7

    Pr(No more than 4) = Pr(0) + Pr(1) + Pr(2) + Pr(3) + Pr(4) = 1 - Pr(7) - Pr(6) - Pr(5)

    Let's see what you get.
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