Aims The main aim of this section is to discuss several ways of finding averages and to introduce you to the statistical facilities of your calculator.
A single number which is typical or representative of a collection (or batch - statistical term for a set of collected data.) of numbers is commonly referred to as an average. There are several different ways of defining such a number. Two are discussed briefly in Subsection 3.1: the mean and the median. Subsection 3.2 then shows how weights can be included, giving rise to the notion of a weighted mean.
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