For example, min, max, first, last, average and stddev are available to help slice and dice your data. The full list of aggregate functions is available in the help documents.
The trick to access these other options in the user interface is scrolling down in the Measure selection box. Once you scroll, a world of other features become available.
As a bonus, a binding statement will enable switching the chart between one and two standard deviations. All of this can be done without writing a single SAQL statement.