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- Study meanThis page from mathsisfun.com provides several examples showing how to calculate the mean of a set of numbers. One of the examples involves negative numbers. At the end, you can link to "the mean machine" or take a quiz. For a more advanced discussion about mean, see http://www.onlinemathlearning.com/mean.html.

When most people say "average" they are talking about the "mean" of a data set, but in statistics, "average" can refer to the mean, the median and the mode.

Some data sets have no mode, and some have more than one mode!

**Study and practice**

- Study medianRead about the median at mathsisfun.com. At the bottom of this page, you can try finding the median of different data sets, and you can take a quiz on medians. For a more advanced discussion of median, see www.onlinemathlearning.com/median.html.
- Quiz yourself on mean, median and modeThis page from mathsisfun.com provides a quick overview of mean, median and mode and then has a quiz at the end.

Use these search terms to find your own resources:

*measures of central tendencymeasures of central valuehow to find mean, median and modebasic statistics*