Probability is the degree of belief that a particular event will occur. It is a number between 0 and 1, that indicates the relative frequency of an event in a sample of data. In mathematics, it is often expressed as a fraction, or as a decimal number. The application uses a combination of a graphical interface and mathematical formulas to help you calculate and visualize probability. 

This application contains all the formulas, definitions, and calculations from probability theory. The user can make calculations by typing in the form and then clicking on the result. It is possible to use both the built-in calculator and the application's built-in calculator to perform calculations. The results are presented in a graphical interface.