MODE function

Returns the most common value in a data set


 * Arguments can either be numbers or names, arrays, or references that contain numbers.
 * If an array or reference argument contains text, logical values, or empty cells, those values are ignored; however, cells with the value zero are included.
 * Arguments that are error values or text that cannot be translated into numbers cause errors.
 * If the data set contains no duplicate data points, MODE returns the #N/A error value.