제출 #133681

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 19, in <module>
    level_avg = round_num(mean(level))
                          ~~~~^^^^^^^
  File "/usr/lib/python3.13/statistics.py", line 490, in mean
    raise StatisticsError('mean requires at least one data point')
statistics.StatisticsError: mean requires at least one data point

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