推荐回答（4个）
一共可以组成的五位数有：3×4×3×2×1/2 = 36(个)
10023 12003 20013 21003 30012 31002
10032 12030 20031 21030 30021 31020
10203 12300 20103 21300 30102 31200
10230 13002 20130 23001 30120 32001
10302 13020 20301 23010 30201 32010
10320 13200 20310 23100 30210 32100
万位上，1，2，3分别出现12次
千位上，1，2，3分别出现6次
百位上，1，2，3分别出现6次
十位上，1，2，3分别出现6次
个位上，1，2，3分别出现6次
总和：(1+2+3)×10000×12 + (1+2+3)×1000×6 + (1+2+3)×100×6 + (1+2+3)×10×6 + (1+2+3)×6
平均数 = 总和/36 = 10000×2 +1000 +100 +10 + 1 = 21111
（10023+10032+10203+10230+10320+10302+20013+20031+20103+20130+20310+20301+
30021+30012+30201+30210+30120+30102）÷18=21811.3333333333333333333……
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