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Math Help - Basic probability #2

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    Basic probability #2

    2. Maintenance crews from Conoco-Phillips are being sent to inspect a one-mile stretch of pipeline and mark locations that require further attention. Based upon past experience, the crew knows that pipelines of this type average three issues per mile.

    a. What is the expected length of pipeline before the first issue is encountered?

    b. What is the probability that an issue is encountered within the first quarter mile?

    c. What is the probability that the crew inspects more than one mile before the first issue is encountered?



    This is what I have so far:

    a.The expected length is 1.5 miles.
    Last edited by mr fantastic; October 2nd 2009 at 06:02 PM. Reason: Moved from another thread, partial merge of posts.
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