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Math Help - Basic probability #1

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    Basic probability #1

    1. Conoco-Phillips is examining ways of being more efficient with its maintenance.
    a. Currently a worker checks a particular gauge every 60 minutes (at the top of every hour).

    i. If an issue arises, what is the expected amount of time that will pass between the problem and the worker checking the gauge?


    ii. What is the probability that more than ten minutes will pass before the worker checks the gauge?

    b. The refinery is considering increasing the frequency to every thirty minutes (at the top and bottom of every hour).

    i. If an issue arises, what would be the expected amount of time that will pass between the problem and the worker checking the gauge?


    ii. What is the probability that more than ten minutes will pass before the worker checks the gauge?


    This is what I have so far.

    1.Conoco-Phillips is examining ways of being more efficient with its maintenance.
    a.Currently a worker checks a particular gauge every 60 minutes (at the top of every hour).

    i.Thirty minutes is the expected time.


    ii.The probability is 83.33%.


    b.The refinery is considering increasing the frequency to every thirty minutes (at the top and bottom of every hour).

    i.The expected time would be 15 minutes.

    ii.The probability is 66.6%.
    Last edited by mr fantastic; October 2nd 2009 at 05:05 PM. Reason: Moved from another thread, partial merge of posts
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