AVERAGEIF(range, criteria [,average_range]) 
Returns the arithmetic mean of all the numbers in a range that satisfies one condition. 
range  The range of cells you want evaluated. 
criteria  The expression that contains the criteria. 
average_range  (Optional) The actual cells to average. 
Remarks 
* Added in Excel 2007. * This function includes hidden rows. * This function uses the actual cell values and not the displayed formatted values. * If no cells in "average_range" meet the criteria, then #DIV/0! is returned * Arguments that are logical values are excluded. * Arguments that are zero are included. * Arguments that are text are excluded. * If any cell references contain an error, then that error is returned. * If any cell references are empty, then these are ignored. * The "criteria" can contain wildcard characters (?) for a single character and (*) for any sequence of characters. To include these characters prefix them with a tilda (~?) and (~*). * You can use the AVERAGE function to return the arithmetic mean with no conditions. * 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 AVERAGEIF  User Defined Function if you want to use a VBA function instead. * This is similar to the COUNTIF function. * This is similar to the SUMIF function. * For the Microsoft documentation refer to support.office.com 

1  What is the average of all the values in the range "C1:C5" which have 14,000 in the range "B1:B5". 2  This is the same as 1 except the "criteria" uses a cell reference. 3  This is the same as 1 except the "criteria" does not include an equal sign. 4  This is the same as 1 except the "criteria" is not contained in speech marks. 5  What is the average of all the values in the range "C1:C5" which have more than 14,000 in the range "B1:B5". (600 + 800 + 1000) 6  This is the same as 5 except the "criteria" uses a cell reference. 7  If the "sum_range" is left blank, then the "range" of cells is summed. 8  What is the average of all the numbers in the range "B1:B4" that have (7000+14000+21000+28000)/10 in the range "B1:B4". 9  What is the average of all the numbers in the range "B1:B5" that have a value greater than the average of the values in the range "B1:B5". 10  Array Formula. What is the average of all the numbers in the range "C1:C5" that have the letter "o" in the range "E1:E5". 11  Array Formula. What is the average of all the numbers in the range "C1:C5" that have the letter "h" in the range "E1:E5". 
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