In Excel 2010 or later, the functions listed in this category were replaced with new functions that provide improved accuracy and have names that reflect their usage better. The new functions can be found in Statistical functions and Math and trigonometry functions. If backward compatibility is not required, you should start using the new functions.
You can still use these earlier versions of functions for compatibility with earlier versions of Excel. If you are using Excel 2007, you will find these functions in the Statistical or Math & Trig categories on the Formulas tab.