An archer shoots the target 20 times, of which 2 hit the 10 ring, 7 hit the 9 ring, 8 hit the 8 ring, and 3 hit the 7 ring. What are the mean, mode, and median? Which statistic best represents this shooter's shooting level?
一个射手射靶20次，其中2次射中10环，7次射中9环，8次射中8环，3次射中7环．平均数、众数、中位数分别是多少？哪个数据最能代表这个射手的射击水平？
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