You are viewing a free preview of this lesson.
Subscribe to unlock all 10 lessons in this course and every other course on LearningBro.
This lesson covers the three measures of average — mean, median, and mode — along with the range as a measure of spread. These are among the most commonly tested topics in the AQA GCSE Mathematics Statistics paper and appear in a wide variety of question types, from simple calculations to more challenging problem-solving scenarios.
An average is a single value that represents or summarises a set of data. There are three types of average you need to know.
| Average | How to Calculate | When to Use |
|---|---|---|
| Mean | Add up all the values and divide by how many values there are | When all values are important and there are no extreme outliers |
| Median | Arrange values in order and find the middle value | When there are extreme values (outliers) that would distort the mean |
| Mode | Find the value that appears most often | When data is categorical (non-numerical) or you want the most popular value |
Mean = sum of all values / number of values
Subscribe to continue reading
Get full access to this lesson and all 10 lessons in this course.