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Calculator not working for me

  1. Dec 7, 2013 #1
    I am using the PDF for log-normal distribution, which I'm referencing off the wikipedia page:
    here. I am integrating from 0 to infinity with my TI-89. It is not giving me 1, as I'd expect from a PDF, but is giving me infinity. Here is how I'm entering it in the calculator (I've tried a few variations):

    e^(-((ln(x-1))^2/2))/(sqrt(2*pi)*x)

    mu and sigma are one, so it simplifies to this. What is going on :(

    Also I just tried integrating from 0 to 12, and it also says infinity. I guess I am doing something wrong :(


    Thank you
     
    Last edited: Dec 7, 2013
  2. jcsd
  3. Dec 7, 2013 #2

    mathman

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    Science Advisor
    Gold Member

    Your exponent is wrong. It should be ((lnx - 1)2)/2.
     
  4. Dec 7, 2013 #3
    thank you
     
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