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【简答题】
设随机变量X的概率密度为 以Y表示对X的三次独立重复观察中事件 出现的次数,则P(Y=2)=_________。
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反馈参考答案：
举一反三
【单选题】We used to believe that life could not exist under extremely hot or cold environment.
A.
Y
B.
N
C.
NG
【简答题】We could not believe the _____ of the hotel receptionist, who had given our room to someone else.(stupid)
【简答题】翻译 (1)They are preparing for the party. (2)Bob is arriving in London. (3)No matter what he said,we could not believe him.
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