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The average rule in conditional formatting can be added and deleted using the methods of the IAboveAverage interface.
Refer to the following example code to add average rule to a range of cells in a worksheet.
// Adding average rule
Workbook workbook = new Workbook();
IWorksheet worksheet = workbook.getWorksheets().get(0);
worksheet.getRange("A1").setValue(1);
worksheet.getRange("A2").setValue(2);
worksheet.getRange("A3").setValue(3);
worksheet.getRange("A4").setValue(4);
worksheet.getRange("A5").setValue(60000000);
IAboveAverage averageCondition = worksheet.getRange("A1:A5").getFormatConditions().addAboveAverage();
averageCondition.setAboveBelow(AboveBelow.AboveAverage);
averageCondition.setNumStdDev(2);
averageCondition.setNumberFormat("0.00");