概率P{max(X1,X2,X3,X4,X5)>15}=()。
A: 0.2533
B: 0.2893
C: 0.2923
D: 0.2934
A: 0.2533
B: 0.2893
C: 0.2923
D: 0.2934
举一反三
- 假设某总体服从正态分布N(12,4),现从中随机抽取一容量为5的样本X1,X2,X3,X4,X5,则: 概率P{max(X1,X2,X3,X4,X5)>15}=()。 A: 0.2533 B: 0.2893 C: 0.2923 D: 0.2934
- 继续上题,为了程序编写简洁,要给数据框x中的6列重新命名为x1,x2,x3,x4,x5,x6,应该使用的命令是() A: ColNames(x) <- c("x1","x2","x3","x4","x5","x6") B: Names(x) <- c("x1","x2","x3","x4","x5","x6") C: colnames(x) <- c("x1","x2","x3","x4","x5","x6") D: colname(x) <- c("x1","x2","x3","x4","x5","x6")
- 设X1,X2,…,X5为来自总体X~N(12,4)的样本,试求1)P(X(1)<10); 2)P(X(5)<15).
- 设X为总体X~N(3,4)中抽取的样本(X1,X2,X3,X4)的均值,则P(-1<X<5)=()
- 已知数据x1,x2,x3,x4,x5的平均数为a,则数据4x1,4x2,4x3,4x4,4x5的平均数为______;4x1-2,4x2-2,4x3-2,4x4-2,4x5-2的平均数为______.