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【简答题】
已知随机变量ξ～N（0，σ 2 ），已知P（ξ＞2）=0.023，则P（|ξ|≤2）=______．
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反馈参考答案：
举一反三
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【单选题】Why do you think the captain follows Maria out of the room, calling her name to stop here at the end of the video clip?
A.
Because he is pleased with her children’s singing and wants to say sorry to Maria.
B.
Because he is angry that Maria has brought music back to the house and wants to find more fault with him.
C.
Because he wants to tell her about his marriage plan with the baroness and ask her to leave.
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