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    jazteny24's Avatar
    jazteny24 Posts: 1, Reputation: 1
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    #1

    Mar 27, 2007, 06:32 AM
    statistics questions
    let say 20% percent of americans used the emergency room last year. Now if I choose 17 people at random find the probability that 6 of them used the emergency room last year. Also finf the probability that at least 5 used the emergency room last year. Finally find the mean and the variance of this experiment.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 27, 2007, 10:35 AM
    Think binomial probability.

    Exactly 6:



    At least 5:


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