AVERAGE(number1 [,number2] [..]) 
Returns the arithmetic mean of non blank cells in a list, table or cell range. 
number1  The first number. 
number2  (Optional) The second number. 
Remarks 
* The arithmetic mean is the most common measure of central tendency. * This function includes hidden cells. * Arguments that are numbers are included. * Arguments that are zero are included. * Arguments that are dates are included. * Arguments that are logical values are excluded from the denominator. * Arguments that are text are excluded from the denominator. * If any cell references are empty, then these are excluded. * If any cell references contain an error, then that error is returned (Row 15). * You can have a maximum of 255 arguments. * You can use the AVERAGEA function to include logical values and text in the denominator. * You can use the AVERAGEIFS function to satisfy multiple conditions. * You can use the AVERAGEVISIBLE  User Defined Function to exclude hidden cells. * You can use the AGGREGATE function to exclude hidden cells. * This is similar to the COUNT function. * This is similar to the MAX function. * This is similar to the MIN function. * This is similar to the SUM function. * For an illustrated example refer to the Quant > Central Tendency > Mean page. * You can enter the abbreviated function name "=AVG()" although you will be prompted to change this to "AVERAGE". * For the Microsoft documentation refer to support.microsoft.com 

1  What is the arithmetic mean or average of 2 and 4. 2  What is the arithmetic mean or average of 5, 10 and 15. 3  What is the arithmetic mean or average of 5, 10, 15 and 0. Zeros are included. 
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