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.