Returns the most frequently occurring, or repetitive, value in the argument list. Like MEDIAN, MODE is a location measure.
Syntax
MODE(number1,number2,...)
Number1, number2,... are 1 to 30 arguments for which you want to calculate the mode.
Remarks

The arguments should be numbers or column references that contain numbers.

If a column reference argument contains text, logical values, or is empty, those values are ignored; however, arguments with the value zero are included.

If the data set contains no duplicate data points, MODE returns the #N/A error value.
In a set of values, the mode is the most frequently occurring value; the median is the middle value; and the mean is the average value. No single measure of central tendency provides a complete picture of the data. Suppose data is clustered in three areas, half around a single low value, and half around two large values. Both AVERAGE and MEDIAN may return a value in the relatively empty middle, and MODE may return the dominant low value.
Example
Col1 
Col2 
Col3 
Col4 
Col5 
Col6 
Formula 
Description (Result) 
5.6 
4 
4 
3 
2 
4 
=MODE([Col1], [Col2], [Col3], [Col4], [Col5], [Col6]) 
Mode, or most frequently occurring number (4) 