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. 
* 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.
* If you want to use a VBA function instead you can use the User Defined Function
* 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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