code: def get_mode(self):
          
          # http://stackoverflow.com/questions/10797819/finding-the-mode-of-a-list-in-python
          return max(set(self._entry_scores), key=self._entry_scores.count)
docs: Gets the mode of the score.
  
          If this system is based on grades, the mode of the output score
          is returned.
  
          return: (decimal) - the median score
          *compliance: mandatory -- This method must be implemented.*