This category of functions largely duplicates summary functions available via the Insert | Summary option from the Crystal Reports pull-down menus. By using these summary functions, you may include the same summary calculations available from the Insert | Summary option in formulas. In fact, if you add a report summary to a report with Insert | Summary and then double-click it in the Fields tree of the Formula Editor, the following summary functions will be inserted in your report automatically.
Returns a numeric value indicating the average of the supplied database field or formula.
f – the database or formula field to summarize for the entire report. This must be a numeric field.
Average (f1, f2)
f1 – ...