Mean - Study Guide

The mean, also known as the average, is a measure of central tendency. It is calculated by adding up all the values in a set of numbers and then dividing by the total number of values.

Calculating the Mean

To calculate the mean of a set of numbers:

1. Add up all the values in the set
2. Count the total number of values in the set
3. Divide the sum by the total number of values

Example

Let's calculate the mean of the following set of numbers: 5, 7, 11, 15, 21.

Step 1: Add up all the values: 5 + 7 + 11 + 15 + 21 = 59

Step 2: Count the total number of values: 5

Step 3: Divide the sum by the total number of values: 59 / 5 = 11.8

So, the mean of the set is 11.8

Study Tips

• Practice calculating the mean of different sets of numbers
• Understand the concept of central tendency and how the mean represents it
• Review real-life examples of when the mean is used, such as in sports statistics or financial reports

Summary

The mean is the average of a set of numbers, calculated by adding up all the values and then dividing by the total number of values.

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