网院北语17春《概率论与数理统计》作业1234（答案）
17春《概率论与数理统计》作业_1一、单选题北京语言大学网络教育学院
1.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/525.jpg
2.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/479.jpg
答案C
3.
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4.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/553.jpg
5.
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6.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/533.jpg
7.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/578.jpg
8.
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9.
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10.一批产品共10件，其中有2件次品，从这批产品中任取3件，则取出的3件中恰有一件次品的概率为
A.1/60
B.7/45
C.1/5
D.7/15
11.
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12.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/547.jpg
13.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/509.jpg
14.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/576.jpg
15.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/498.jpg
16.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/534.jpg
17.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/563.jpg
18.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/577.jpg
19.
http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/562.jpg
20.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/476.jpg
http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/530.jpg
http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/554.jpg
二、判断题
1.设随机变量X和Y独立同分布，记U＝X－Y，V＝X+Y则随机变量U与V也不独立
答案错误
2.设随机变量X服从指数分布，则随机变量Y＝min（X，2）的分布函数至少有两个间断点()
答案错误
3.设随机变量X服从指数分布，则随机变量Y＝min（X，2）的分布函数恰好有一个间断点（）
答案正确
17春《概率论与数理统计》作业_2
一、单选题
1.
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2.
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3.
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4.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/506.jpg
5.
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6.
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7.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/548.jpg
8.
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10.
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11.
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12.
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13.
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14.
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15.
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16.
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17.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/538.jpg
18.袋中有50个乒乓球，其中20个黄的，30个白的，现在两个人不放回地依次从袋中随机各取一球。则第二人取到黄球的概率是
A.1/5
B.2/5
C.3/5
D.4/5
19.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/491.jpg
20.
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21.http//otsstatic.chinaedu.net/ots/blcu/eblcuimage/485.jpg
22.
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二、判断题
1.对任意事件A与B，则有P(A∪B)=P(A)+P(B)（）
答案错误
2.设随机变量X和Y独立同分布，记U＝X－Y，V＝X+Y则随机变量U与V也相关系数为零（）。
答案正确
3.对任意事件A和B，必有P(AB)=P(A)P(B)()
答案错误
17春《概率论与数理统计》作业_3
一、单选题
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2.
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3.
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4.
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5.
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6.
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7.
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8.
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9.
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10.
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11.
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12.
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13.
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14.
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15.
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16.
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17.
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18.
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19.
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20.
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21.
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22.
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二、判断题
1.设A、B是Ω中的随机事件则(A∪B)B=A()
答案错误
2.若X服从二项分布b(np)则EX=npq()
答案错误
3.假设检验基本思想的依据是小概率事件原理（）
答案正确
17春《概率论与数理统计》作业_4
一、单选题
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二、判断题
1.设随机变量X服从指数分布，则随机变量Y＝min（X，2）的分布函数是连续函数()
答案错误
2.设随机变量X和Y独立同分布，记U＝X－Y，V＝X+Y则随机变量U与V也独立()
答案错误
3.若X服从参数为λ的泊松分布，则EX=DX()
答案正确
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