# Outlier

In statistics, an outlier is a point in a sample that has a substantially different value from the rest.

Outlier is a high school-level concept that would be first encountered in a probability and statistics course. It is an Advanced Placement Statistics topic and is listed in the California State Standards for Grade 4.

### Prerequisites

Sample: | In mathematics, a sample of a population is a subset that is obtained to investigate the parent population's properties. |