# Standart normal distribution

1. Apr 11, 2010

### coki2000

Hello,
Where does the standart normal distribution function

$$\Phi (x)=\frac{e^{-\frac{x^2}{2}}}{\sqrt{2\pi }}$$

2. Apr 11, 2010

### mathman

It comes from the central limit theorem, one of the most important theorems in probability theory. Look it up on google.