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This article describes the formula syntax and usage of the AVERAGE function in Microsoft Excel. Returns the average (arithmetic mean) of the arguments. For example, if the range A1:A20 contains numbers, the formula =AVERAGE(A1:A20) returns the average of those numbers. AVERAGE(number1, [number2], ...) The AVERAGE function syntax has the following arguments: Number1 Required.
Calculating the Mean. 1  1. Use the AVERAGE function in Excel to find the mean of a set of numbers. Enter the range of numbers in your Excel spreadsheet. 2  2. Click Formulas and select the Insert Function tab. Enter the numbers in your Excel spreadsheet in either a row or a column. 3  3. Scroll down and select the Average function.