摘要： 解: (1)==9.8． ==9.8 ． ··············· (2)∵=[2+2+2+2+2+2 +2+2+2+2]=0.214． ························ =[2+2+2+2+2+2+2 +2+2+2]=0.146． ∴>.∴乙运动员的发挥比较稳定．······························································

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