This project contains:

• T-SQL implementations of the Standard Normal Distribution density probability function and three approximations of the cumulative probability function.
• A console application used to verify the accuracy of the implementations using Excel as the reference.
• Output files of the console application when run using Excel 2010 and Excel 2007.

Be sure to read the full discussion on the blog post at http://formaldev.blogspot.com/2012/09/T-SQL-NORMDIST-1.html before using this code.