设X-N(0,1),则P{XA.1/2 B.1/3 C.1/4 D.1/5

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问题 设X-N(0,1),则P{X

选项 A.1/2
B.1/3
C.1/4
D.1/5

答案A

解析X服从标准正态分布,其图像关于y轴对称,故P{X
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