## Statistics Tutorials: The Definitive Guide to Percentile - All the Tricks on the Book

### Cumulative Distribution

${{F}_{X}}\left( x \right)=\Pr \left( X\le x \right)$

### What is a Percentile?

$\Pr \left( X\le {{P}_{\alpha }} \right)=\alpha$

### How to Compute is a Percentile?

$\alpha ={{F}_{X}}\left( x \right)$