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提问人:网友anonymity
发布时间:2022-01-06
[主观题]
若X~N(μ,σ2),则E(X)=μ,D(X)=σ2.()
若X~N(μ,σ2),则E(X)=μ,D(X)=σ2.( )
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查看官方参考答案
若X~N(μ,σ2),则E(X)=μ,D(X)=σ2.( )
A.若X~B(10,0.3), Y~B(15,0.2),则X+Y~B(25,0.5)
B.若X~P(1.2), Y~P(0.8),则X+Y~P(2)
C.若X~N(2,5), Y~N(1,4),则X-Y~N(1,1)
D.若X~E(0.1), Y~E(0.1),则min{X,Y}~E(0.1)
A.36,54
B.45,54
C.54,36
D.54,45
A.36,54
B.45,54
C.54,36
D.54,45
若随机变量X的分布列为
X | -2 | 0 | 2 |
P | 0.4 | 0.3 | 0.3 |
则E(X)=______,E(X2)=______,D(X)=______.
A.1
B.2
C.n
D.n - 1
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