.概率论与数理统计(作业题-答案详解)

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1、《概率论与数理统计》模拟试卷二四、【计算题】16、10个球中有3个红球7个绿球，随机地分给10个小朋友，每人一球，则最后三个分到球的小朋友恰有一个得到红球的概率是多少？17、设随机变量X与Y同分布，X的密度函数为，设与相互独立，且,求a的值．18、设连续型随机变量的分布函数为,求的期望与方差的值。19、假设随机变量X在(1,2)上服从均匀分布，试求随机变量的概率密度。《概率论与数理统计》三四、【计算题】16、P（A）=P（B）=0.4,P(A∪B)=0.5,则的值为多少？17、设随机变量X的概率密度为，则是多少？18、为了检查汽车的设备状况，在公路上设立了检查观察站。

2、汽车按普通流来到观察站，前后两辆汽车来到观察站之间的时间间隔为随机变量T，它具有分布密度为,求随机变量T的数学期望。19、两台机床加工同样的零件，第一台加工的零件比第二台多一倍，而它们生产的废品率分别为0.03与0.02，现把加工出来的零件放在一起。求从中任意取一件而得到合格品的概率。（英文版）easilyblame,topreventthebrokenwindoweffect.Supervisetheleadingcadrestoplayanexemplaryrole,taketheleadinthestrictimplementationofthean

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