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Math Help - probability question utilising z scores

  1. #1
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    probability question utilising z scores

    The question is:

    Determine the probability of that a project will be completed in 60 weeks or less.

    Context: projects usually are 60wks with a standard deviation of 10 weeks assume that times are normally distributed.

    My question:

    1, how is this question answered, and is it as I have set out - z= the expected outcome (60) minus the sample mean (60) divided by the standard deviation (10). is the answer 0 or z (50%)


    2, what is this calculation called i.e. a discrete independent or ??


    3, what should the calculation or/and equation look like.


    Many thanks for you help in advance

    Colin
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  2. #2
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    Re: probability question utilising z scores

    Hey colinb0.

    The calculation is called a z-score calculation. The equation looks exactly like what you have shown in 1. except in general you have a variable mean and standard deviation instead of the specific one in your question.
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