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

    Jul 2, 2011, 10:11 AM
    probability
    Cars are arriving at a toll booth at a rate of 4 per minute, what is the probabiulity that exactly 8 cars will arrive in the next two minutes
    JudyKayTee's Avatar
    JudyKayTee Posts: 46,503, Reputation: 4600
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    #2

    Jul 2, 2011, 02:45 PM

    Do you work for the Thruway Authority or is this homework?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Jul 3, 2011, 02:48 AM

    If it is the latter, post your attempt please.
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #4

    Jul 5, 2011, 08:25 AM
    The OP seems to have fled the scene (not surprising given the turnover rate at the Thruway Authority :p).

    Anyway, I feel like I'm missing something. The problem states that the cars arrive at a rate of 4 per minute. It doesn't say an average of 4 per minute; it doesn't give a variance or standard deviation. It just says flat out 4 per minute. Barring any other information and the use of the word "rate", which I interpret to mean that a car arrives every 15 seconds, it seems to me that there's a 100% chance that exactly 8 cars will arrive in the next two minutes. Jerry? Any thoughts?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Jul 5, 2011, 08:49 PM

    Indeed, there is also a lack of information, unless there is actually not and the answer becomes straightforward. :)
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #6

    Jul 5, 2011, 09:18 PM
    Good. I feel better knowing you agree. LOL! :)
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #7

    Jul 6, 2011, 01:05 AM

    But not me when I can't rep you from v2 :(
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