已知随机变量ξ~N(0,σ2)，若P(-2≤ξ≤0)=0.2，则P(ξ≥2)等于

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问题选择题

已知随机变量ξ~N(0,σ²)，若P(-2≤ξ≤0)=0.2，则P(ξ≥2)等于( )

A．0.1

B．0.2

C．0.3

D．0.4

答案

答案：C

选择题

The traditional view is ______ we sleep because our brain is "programmed" to make us do so. [ ]

A. when

B. why

C. whether

D. that

选择题

．Dad always says he prefers _______ outside the shopping centre _____ together with my mother．

A．waiting; to shop

B．to wait; to shopping

C．waiting; rather than shopping

D．waiting; to shopping