---
title: "Mean — AP Psychology Definition & Exam Guide"
description: "The mean is the average of a dataset, found by summing all values and dividing by the count. Learn how it pairs with standard deviation and outliers on AP Psych."
canonical: "https://fiveable.me/ap-psych-revised/key-terms/mean"
type: "key-term"
subject: "AP Psychology"
---

# Mean — AP Psychology Definition & Exam Guide

## Definition

The mean is simply the sum of all values in a dataset divided by the total number of values. It's often referred to as the "average."

## Related Study Guides

- [1.5 Statistical Analysis in Psychology](/ap-psych-revised/unit-1/statistical-analysis-psychology/study-guide/St9jOZWjJV5GZX6HA9Uo)

## Review

### Related Terms

- [Range](/ap-psych-revised/key-terms/range): The difference between the highest and lowest scores in a distribution.
- [Standard Deviation](/ap-psych-revised/key-terms/standard-deviation): A computed measure of how much scores vary around the mean score.
- Outlier: A value that "lies outside" (is much smaller or larger than) most of the other values in a dataset.