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    bendeli's Avatar
    bendeli Posts: 1, Reputation: 1
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    #1

    Jul 24, 2008, 08:35 PM
    Probability - survey
    In a large survey, it was discovered that 1 out of every 5 adults visits Disney World every year. If 30 adults are randomly selected what is the probability that exactly 7 of them will visit Disney World this year?

    The answer is .154. I do not understand how answer was gotten.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 25, 2008, 04:29 AM
    It is a binomial probability.

    It was gotten like so:



    Where C(30,7) is the number of ways to choose 7 items from 30
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