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设随机变量ξ服从正态分布N(2,σ2),若P(ξ>c)=a,则(ξ>4-c)等于...
设随机变量ξ服从正态分布N(2,σ2),若P(ξ>c)=a,则(ξ>4-c)等于( )
A.a
B.1-a
C.2a
D.1-2a
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