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.*

def get_mode(self):
        """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.*

        """
        # http://stackoverflow.com/questions/10797819/finding-the-mode-of-a-list-in-python
        return max(set(self._entry_scores), key=self._entry_scores.count)