*Clinical Concepts and Practical Management Techniques in Dentistry*

The sum of all probabilities for all potential values must be equal to 1. In addition, the likelihood for a particular value or set of values must be between 0 and 1 [7].

The probability distributions define the dispersion of random variable values. Consequently, the type of variable determines the type of distribution of the likelihood [8]. For a single random variable, the statisticians split the distributions into the following two types:

