Watch the animation for calculating range and then consider the question below.

**Why use these techniques? Is it appropriate?**

- The range is used to show the spread of a data set.
- By calculating the range of two or more different sets of data, it allows us to compare the range easily e.g. temperature data for different locations.
- By calculating the
**range**and the**mean**, it shows how well the mean value represents the set of data. If the range is a high number – or there is a large spread, then this may be an indication that calculating the mean would not be representative of the set of data and another central tendency technique would be more appropriate e.g. mode or median.