题目内容

设X服从参数为λ的泊松分布,PX=1=PX=2,则概率P0<X2<3=______.

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袋中有8个球,其中有3个白球,5个黑球.现从中随意取出4个球,如果4个球中有2个白球2个黑球,试验停止,否则将4个球放回袋中重新抽取4个球,直至取到2个白球2个黑球为止.用X表示抽取次数,则PX=k=______(k=1,2,…),

When will the tourists go to the Temple of Heaven according to the schedule At ______.

Questions 13 to 15 are based on the conversation you have just heard.

A. He has a meeting. B. He’s going out of town.
B. C. He’ll be getting his car fixed. D. He has to do some work then.

已知Y=lnX~N(μ,σ2),求X的概率密度.

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