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-   -   Probability (https://www.askmehelpdesk.com/showthread.php?t=585230)

  • Jul 2, 2011, 10:11 AM
    heidics
    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
  • Jul 2, 2011, 02:45 PM
    JudyKayTee

    Do you work for the Thruway Authority or is this homework?
  • Jul 3, 2011, 02:48 AM
    Unknown008

    If it is the latter, post your attempt please.
  • Jul 5, 2011, 08:25 AM
    jcaron2
    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?
  • Jul 5, 2011, 08:49 PM
    Unknown008

    Indeed, there is also a lack of information, unless there is actually not and the answer becomes straightforward. :)
  • Jul 5, 2011, 09:18 PM
    jcaron2
    Good. I feel better knowing you agree. LOL! :)
  • Jul 6, 2011, 01:05 AM
    Unknown008

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

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