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Math Help - can i use normalcdf for this question

  1. #1
    Junior Member
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    May 2005
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    can i use normalcdf for this question

    sevay taken outside a resturant for wating time. mean in 45min and standard deviation is 12min.

    determine the probability that a random person had to wait less that 20 min.

    can I use normalcdf(0,20,45,12) to get the right answer?
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  2. #2
    Newbie
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    Aug 2005
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    'straya
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    You could use a normal cdf - shouldn't be a huge problem. However, a lot of queueing problems assume a poisson distribution from memory.
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