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NormalCDF equation

  1. Mar 1, 2009 #1
    Anyone who has a TI-83 or 84 calculator will probably know about the normalcdf(minimum, maximum, mean, std. deviation) command. It is used to find the area under a normal curve between two given points.

    My question is; does anyone know the equation that the calculator uses to find this result? I looked in my Probability and Statistics text book, but could only find the equation for normalpdf:
    [tex]y=\frac{1}{\sigma \sqrt{2\pi}}e^{-\frac{1}{2}(\frac{x-\mu}{\sigma})^2}[/tex]​
    If anyone could help me find the equation for normalcdf, I would greatly appreciate it.

    Thank you in advance.
  2. jcsd
  3. Mar 1, 2009 #2
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