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Thread: Probability in my exam

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    Re: Probability in my exam




    Which would be...

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    newbiestats (11-14-2011)

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    Re: Probability in my exam

    Thanks a lot, I appreciate all your help. You have been very helpful to me. Thanks

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    Re: Probability in my exam


    Quote Originally Posted by newbiestats View Post
    Here is the scenario for my practice exam:

    "You have been hired by a firm which produces customised engineering machinery to provide some information for their staff planning. They have informed you that the time taken to assemble a customised engineering unit is normally distributed with a mean of 20 hours and a standard deviation of 4 hours.
    What is the probably that a particular unit will take more than 26 hours to complete? "

    And here is the solution: (26-20)/4= 1.5, Probablitiy = 0.5 - 04332 = 0.0668 (now my question is where did 0.5 come from??)

    Here is my solution for your reference
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