from collections import defaultdict

class StatsList(list):

########### MEAN ###########
    def mean(self):
        return sum(self) / len(self)
    # END mean

########### MEDIAN ###########
    def median(self):
        if len(self) % 2:
            return self[int(len(self) / 2)]
        else:
            idx = int(len(self) / 2)
            return (self[idx] + self[idx-1]) / 2
        # ENDIF
        
    # END median

########### MODE ###########
    def mode(self):
        freqs = defaultdict(int)
        for item in self:
            freqs[item] += 1
        # ENDFOR

        mode_freq = max(freqs.values())
        modes = []
        for item, value in freqs.items():
            if value == mode_freq:
                modes.append(item)
            # ENDIF
        # ENDFOR
            
        return modes

    # END mode

# END CLASS StatsList