Calculates the average (arithmetic mean) of the values in the list of arguments. Unlike the AVERAGE functions, text and logical values such as TRUE and FALSE are included in the calculation.
Syntax
AVERAGEA(value1,value2,...)
Value1, value2,... are 1 to 30 arguments for which you want the average.
Remarks

Arguments that contain text evaluate as 0 (zero). Empty text ("") evaluates as 0 (zero). If the calculation must not include text values in the average, use the AVERAGE function.

Arguments that contain TRUE evaluate as 1; arguments that contain FALSE evaluate as 0 (zero).
Examples
Col1 
Col2 
Col3 
Col4 
Col5 
Col6 
Formula 
Description (Result) 
10 
7 
9 
2 
0 
=AVERAGEA([Col1],[Col2],[Col3],[Col4],[Col5]) 
Average of the numbers, and the empty argument (5.6) 

10 
10 
9 
2 
1 
=AVERAGEA([Col1],[Col2],[Col3],[Col4],[Col6]) 
Average of the numbers (6.4) 