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[单选题]
某次百分制考试共有30名考生参加,每人的成绩均为正整数,所有考生平均成绩为,且所有考生成绩均不相同。问成绩低于的考生最多有多少人()
A.7
B.8
C.9
D.10
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.7
B.8
C.9
D.10
A.(90,110]
B.(95,125]
C.(100,120]
D.(105,115]
A.D(x)=s2
B.X=μ
C.D(x)=σ2
D.E(x)=μ
A.17
B.18
C.20
D.21
A.89
B.88
C.91
D.90
A.88
B.89
C.90
D.91