21秋西南大学1152 概率论与数理统计在线作业题目-西南大学-无忧答案网

homework 发表于 2021-10-14 13:08:30

21秋西南大学1152 概率论与数理统计在线作业题目

1152 概率论与数理统计
1.[单选题] 设随机事件A与B相互独立，且P(A)=1/5，P(B)=3/5，则P(AUB)=（）

A.4/5
B.17/25
C.23/25
D.3/25
2.[单选题] 一批产品中有5%不合格品，而合格品中一等品占60%，从这批产品中任取一件，则该件产品是一等品的概率为（　　　）
A.0.57
B.0.20
C.0.30
D.0.38
3.[单选题] 设A，B为随机事件，B<img width="15" height="11" src="data:image/png;base64,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"/>A，则
A.P(AB)=P(A)
B.P(B|A)=P(B)
C.P(B-A)=P(B)-P(A)
D.P(AUB)=P(A)
4.[单选题] 设随机变量X~B(100,0.2)，Ф(x)为标准正态分布函数，Ф(2.5) =0.9938，应用中心极限定理，可得P{20≤x≤30}≈( )
A.0.6681
B.0.4938
C.0.4221
D.0.9776
5.[单选题] 设X为随机变量，E(X)=2，D(X)=5，则E(X+2)2=( )
A.9
B.21
C.4
D.13
6.[单选题] 设随机变量X服从参数为0.5的指数分布，则E(2X-1)=（）
A.3
B.1
C.4
D.0
7.[单选题] 设(X,Y)为二维随机向量,E(X)=E(Y)=0,D(X)=16,D(Y)=25,<img width="29" height="18" src="data:image/png;base64,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"/>=0.6,则有Cov(X,Y)=（）

A.5
B.0
C.12
D.0.5
8.[单选题] 设A、B为随机事件，<img width="132" height="38" style="width: 96px; height: 26px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKUAAAAvCAYAAACCAApkAAAAAXNSR0ICQMB9xQAAAAlwSFlzAAASdAAAEnQB3mYfeAAAABl0RVh0U29mdHdhcmUATWljcm9zb2Z0IE9mZmljZX/tNXEAAARySURBVHja7Zw/TuQwFMZ9AA6wSGM6DgBmWspZC1GvmImoFlEhS4gDhOlGWnEBOrql2BvQbsMNKLjB3IHFyTpkHP95TjLBJq94BczgSX75/Py9Zw9kuVwSDIyYAiFgoCgxMFCUGChKDAwUZUCsVpc7GZ9eU0peWHZ7igKIk/GoYHFKHykha0LIG4oyXsajA5cLfiChoSjjZYzAMFCUKEpkjKJEUaIoUZQYKEoUJYoSRYmBokRRbj4wQt5QlF9VlDNxgaKMk3GvFyOy6VmbCxEzdjHNxNm2YS0YeZAPtYoJf7pcrXaGfGBtGXUVZUqM4YNXQdeUZ7n+QVczekPZ4g56AbcZO1XpvdiempAnOru6SSVjhfKxMbKOQ+mLSUSholScU2LsnV36Hqac6cXeJls81GHXf4ald/rCRX6gfqegpeT1oHx8jKRwpJgVD8lCiVXnESJKnXMqjJ0vFiAJez3P891mlih/n+fnu4eEPtcF5goFpv4QNiEePuufF2tA+BT35WFUjKMtc8qX6UKGitLGOQXG/iXK4Anq0EOz5ILRu6Mj+tv0MNXYqSzjED6QlaR4v/Z6mT3bZ0oX59gZ21P/++xmhLzqF1+fwaE+RYKWnsqUGVxZI8oKE8AH4pfVOHV/rSyAZNXGU/o4x87YeWMy9W/6JX5SAKdl+g/pRxXvpfxRgrBlGJO/ghUXHzFUBoDwgfTsVEbcLHIOn+ci329TfUM4x87Y45foulwCPirLKc+u1U26bq7hbyh9lO+rvI5lOUuluQ3hA2GkZ61czPdl5qwLGypKKOfYGbtNsscrQkVpnH0DitI381VAx4Py8TGyjaOypykjua4TyvmzGHcSpc0vtRGl8jfQsV3AYlm+oXx8jHQ/2VjSDYKyPdwQzrEz7pQBfTOu7m+gfwP97M+MkGt03W85jq2lZP6Oi0mUoZxjZ+zob5lbNqb3mmZOWUE2fVHVcLZstcVSGcqWil7IhPJxMarG0fzkd7Z377I3uijbcI6dscG8b26Z+WaT3oOrWiLa3qdaTnz7ojH00Oo7KuSI/1HX2IaPiVFznI+YTCZ/XXvUSpRdOMfM2Fl9h/irkB0d/1IX125DxvnPrhmlT0ZdTwmlwLg3j6V7mnbpfLszWM7Oann09APVA+Tz/DgmRl1FOUSWlNahyuLUPQFMjPvt27X0KWUqp3emHYw+BckZ+6VEWPUDLd5QNsLnQvRaCPTh5dqKcgjGBdc5P1b2o2Js8cc2xv3OkIjPU0pY5gMgZD2kv/rK5yml8Gcz8aNZp8CKwq2IMrUI6TdG0y5J4OR5o70VcGAHRdljAYKi1Dy0EN+UXejt5PkYomgiB85iDCDXWjEZOulHC66oxPfYfSoHilOM6tRU4O7RaIFljOUpLdupZ82Qwx/jnMHvlSj+M4Jhi0kU5RLeGlH/eRazZjzF5KgAWfecE/j6RRIC/P/tSXXQuWrYB7bcUJADfoViDFmxPEFVq7wzcRI6DsLEiC4QAgaKEgMDRYmBosTA6Br/AEqS3Tu8JHseAAAAAElFTkSuQmCC"/>则P(AB)=( )
A.1/6
B.2/3
C.5/6
D.1/3
9.[单选题] 设随机变量X，Y相互独立，且P{X≤1}=0.5，P{Y≤1}=?，则P{X≤1,Y≤1}=( )

A.2/5
B.3/4
C.1/6
D.1/5
10.[单选题] 已知一射手在两次独立射击中至少命中目标一次的概率为0.96，则该射手每次射击的命中率为（）
A.0.04
B.0.2
C.0.96
D.0.8
11.[单选题] 设随机变量X～N(1，1)，为使X+C～N(0，1)，则常数C=（）
A.1
B.-1
C.0
D.2
12.[单选题] 对正态总体的数学期望μ进行假设检验，如果在显著水平0.05下接受H0 ：μ=μ0，那么在显著水平0.01下，下列结论中正确的是（ ）
A.必接受H0
B.不接受，也不拒绝H0
C.可能接受H0，也可能拒绝H0
D.必拒绝H0
13.[单选题] 甲、乙两个气象台独立地进行天气预报，它们预报准确的概率分别是0.8和0.7，则在一次预报中两个气象台都预报准确的概率是( )
A.0.28
B.0.1
C.0.78
D.0.56
14.[单选题] 10粒围棋子中有2粒黑子,8粒白子,将这10粒棋子随机地分成两堆,每堆5粒,则两堆中各有1粒黑子的概率为（）
A.1/3
B.5/9
C.7/9
D.2/9
15.[单选题] 设x1, x2, …, x100为来自总体X ~ N(0，42)的一个样本，以<img width="17" height="21" style="width: 17px; height: 21px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAUCAYAAABroNZJAAAAAXNSR0ICQMB9xQAAAAlwSFlzAAASdAAAEnQB3mYfeAAAABl0RVh0U29mdHdhcmUATWljcm9zb2Z0IE9mZmljZX/tNXEAAAC4SURBVDjLY2hsbGSgFDOMAEOA4D8uPMS80xBt7ANzunF0gw9IrD7Pw9BIluEUg4zHnrSODh6iXNLRkcYTZcywEKQpL8/F1iM6z4ss78BcJOsRXU92mNTXx0oaMzDchXmJIkMYjKMWkm1ItIdHcrSHbD0Dg/Hd2Pp6SZINyYs2jfCIrLcDxYosg+xNj7x6w2hTj0JchqFwctxkixkYZN+YRudFwGLJQ4ZhD4Os0anIvHrVkZyLB8QQAD3Q9KMSv7ksAAAAAElFTkSuQmCC"/>表示样本均值，则<img width="13" height="15" title="202011091604906588794081812.png" style="width: 10px; height: 15px;" alt="捕获3 - 副本.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/11/09/202011091604906588794081812.png"/>~(　　　)
A.N(0，1.6)
B.N(0，0.04 )
C.N(0，0.16)
D.N(0，16)
16.[单选题] 设随机变量X,Y都服从区间上的均匀分布，则E(X+Y)=（　　　）
A.F.0.5
B.1
C.2
D.0
17.[单选题] 设随机变量X～N(0,1)，Y～N(0,1)，Cov(X,Y)=0.5，则D(X+Y)=（）
A.1
B.2
C.3
D.0
18.[单选题] 设某个假设检验的拒绝域为W，当原假设H0成立时，样本(x1，x2，…，xn)落入W的概率是0.1，则犯第一类错误的概率为（）
A.1
B.0.9
C.0.1
D.0
19.[单选题] 设总体X~N(0，1)，x1，x2，…，xn为来自总体X的一个样本，且<img width="124" height="26" style="width: 116px; height: 29px;" src="data:image/png;base64,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"/>，则n=（）
A.6
B.2
C.3
D.5
20.[判断题] 设随机变量X～N(3，22)，则E(2X+3)=1。( )
A.正确
B.错误
21.[判断题] 设A，B为随机事件，则（A-B)∪B等于AB。( )
A.正确
B.错误
22.[判断题] 假设检验中，显著水平α表示H0为真，拒绝H0的概率。( )
A.正确
B.错误
23.[判断题] 设A，B为两个互不相容事件，则P（AB）=0。( )

A.正确
B.错误
24.[判断题] 设(X，Y)为二维随机变量，则Cov(X,Y)=0和X与Y相互独立等价。( )
A.正确
B.错误
25.[判断题] 设A与B互为对立事件，且P(A)>0，P(B)>0，则P(AB)=P(A)P(B) 。( )
A.正确
B.错误
26.[判断题] 设A={2，4，6，8}，B={1，2，3，4}，则A-B={1，2，3，4}。( )
A.正确
B.错误
27.[判断题] 若X是离散型随机变量，则随机变量X的取值个数一定为无限个。( )
A.正确
B.错误
28.[判断题] 设A={2，4，6，8}，B={1，2，3，4}，则A-B={6，8}。( )
A.正确
B.错误
29.[判断题] 设某试验成功的概率为p，独立地做5次该试验，成功3次的概率为<img width="24" height="21" title="202010081602124636359060042.png" style="width: 24px; height: 21px;" alt="捕获2.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/08/202010081602124636359060042.png"/>。( )
A.正确
B.错误
30.[判断题] 已知随机变量X的数学期望E(X)存在，则E=E(X)恒成立。( )
A.正确
B.错误
31.[判断题] 设随机变量X～N(3，22)，则E(2X+3)=2。( )
A.正确
B.错误
32.[判断题] 设A，B为随机事件，则事件“A，B至少有一个发生”可由A,B表示为A∪B 。( )
A.正确
B.错误
33.[判断题] 对于事件A，B，如果<img width="42" height="22" style="width: 42px; height: 22px;" src="data:image/png;base64,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"/>，则<img width="48" height="24" style="width: 48px; height: 24px;" src="data:image/png;base64,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"/>。( )
A.正确
B.错误
34.[判断题] 设A,B,C为随机事件，则事件“A,B,C都不发生”可表示为ABC。( )

A.正确
B.错误
35.[判断题] 若X~B(3,0.2),Y~B(5,0.2),且X与Y相互独立，则X+Y~(8,0.2).( )
A.正确
B.错误
36.[判断题] 设(x1,x2)是来自总体x的一个容量为2的样本，则在下列E(x)的无偏估计量中，最有效的估计量是 0.5(X1+X2)。( )
A.正确
B.错误
37.[判断题] A,B为任意两随机事件，则不一定有P(A∪B)=P(A)+P(B)。( )
A.正确
B.错误
38.[判断题] 设某个假设检验的拒绝域为W，当原假设H0成立时，样本(xl，x2，…，xn)落入W的概率是0.90，则犯第一类错误的概率为0.10。( )
A.正确
B.错误
39.[判断题] 掷一颗骰子，观察出现的点数。A表示“出现3点”，B表示“出现偶数点”，则<img width="40" height="20" src="data:image/png;base64,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"/>。( )
A.正确
B.错误
40.[判断题] 若C为常数，则D(c)=0.( )
A.正确
B.错误
41.[判断题] 设随机变量X与Y相互独立,且X～N(0,l),Y～N(-1,1)，记Z=X-Y，则Z~N(1,1)。( )
A.正确
B.错误
42.[判断题] <img width="579" height="23" title="202010081602120468592097506.png" style="width: 579px; height: 23px;" alt="2.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/08/202010081602120468592097506.png"/>。( )
A.正确
B.错误
43.[判断题] 设某个假设检验的拒绝域为W，当原假设H0成立时，样本(xl，x2，…，xn)落入W的概率是0.95，则犯第一类错误的概率为0.05。( )
A.正确
B.错误
44.[判断题] <img width="593" height="35" title="202010071602039155336096150.png" style="width: 593px; height: 35px;" alt="捕获.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/07/202010071602039155336096150.png"/>。( )
A.正确
B.错误
45.[判断题] <img width="574" height="25" title="202010091602234305936000689.png" style="width: 574px; height: 25px;" alt="15.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/09/202010091602234305936000689.png"/>.
A.正确
B.错误
46.[判断题] 设随机变量X~N(μ，σ2 )，Y服从参数为λ（λ＞0）的指数分布，则<img width="105" height="36" style="width: 105px; height: 36px;" src="data:image/png;base64,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"/> 。( )
A.正确
B.错误
47.[判断题] 每次试验成功率为p(0pp)。( )
A.正确
B.错误
48.[判断题] 设随机变量X与Y相互独立,且X～N(0,l),Y～N(-1,1)，记Z=X-Y，则Z~N(0,1)。( )
A.正确
B.错误
49.[判断题] A,B为任意两随机事件，则P(A∪B)=P(A)+P(B)。( )
A.正确
B.错误
50.[主观填空题] 设相互独立的随机变量X，Y均服从参数为1的指数分布，则当x>0，y>0时，(X，Y)的概率密度f (x，y)=________.
A.
51.[主观填空题] 设X，Y为随机变量，已知协方差Cov(X，Y)=3，则Cov(2X，3Y)=______.
A.
52.[主观填空题] 设A，B为两个随机事件，且A与B相互独立，P(A)=0.3，P(B)=0.4，则P(A<img width="14" height="18" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAAXCAYAAAAGAx/kAAAAAXNSR0ICQMB9xQAAAAlwSFlzAAASdAAAEnQB3mYfeAAAABl0RVh0U29mdHdhcmUATWljcm9zb2Z0IE9mZmljZX/tNXEAAACVSURBVDjLY2hsbGSgBmYYNYg0g4DgPyl4JIZRR0caj4cMwx6c4SLjsSeto4OHaBc1RBv7MDDIvvHIqzeEidXneRjKMjC8YWAwvhtbXy9JtkEgnOMmWwxymXF0gw9FBkHEKTSovj5W0piB4S4ZXsMS2MZRC0mKfmwuQo5RisMIn/fobxBKYsUSVqSlbCCWdcspHmElJAADQVJf02a0jgAAAABJRU5ErkJggg=="/>)=__________.
A.
53.[主观填空题] <img width="970" height="63" title="202010061601986357553094601.png" style="width: 952px; height: 57px;" alt="捕获.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/06/202010061601986357553094601.png"/>
A.
54.[主观填空题] 设随机变量X～U (0，5)，且Y=2X，则当0≤y≤10时，Y的概率密度fY (y)=________.
A.
55.[主观填空题] 连续抛一枚均匀硬币5次,则正面都不出现的概率为 ___________。
A.
56.[主观填空题] 设二维随机变量(X，Y)的概率密度f (x,y)=<img width="134" height="44" src="data:image/png;base64,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"/>则P{X+Y≤1}=________.
A.
57.[问答题] 箱中装有10件产品，其中8件正品，2件次品，从中任取2件，x表示取到的次品数．求：
(1)X的分布律；
(2)X的分布函数F(x);
(3) P{0<X≤2)

A.
58.[问答题] 设某厂生产的食盐的袋装重量服从正态分布<img width="51" height="19" title="202010101602337860222017753.png" style="width: 44px; height: 15px;" alt="捕获1.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/10/202010101602337860222017753.png"/>（单位：g），随机抽取16袋食盐测得平均袋装质量<img width="17" height="29" title="202010101602337931395098767.png" style="width: 11px; height: 17px;" alt="捕获.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/10/202010101602337931395098767.png"/>=496。问在显著水平α=0.05下，是否可以认为该厂生产的袋装食盐的平均重量为500g？（μ0.025=1.96）
A.
59.[问答题] 在某次考试中,随机抽取16位考生的成绩,算得平均成绩为<img width="17" height="24" title="202010101602336263837042401.png" style="width: 12px; height: 16px;" alt="1.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/10/202010101602336263837042401.png"/>=68.95分。若设这次考试成绩<img width="98" height="19" style="width: 75px; height: 16px;" src="data:image/png;base64,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"/>，在显著性水平a=0.05下,可否认为全体考生的平均成绩为70分?(附:u0.025=1.96)

A.
60.[问答题] 有一种含有特殊润滑油的容器,随机抽取9个容器,测其容器容量的样本均值为10.06升,样本标准差为0.246升,在α=0.01水平下,试检验这种容器的平均容量是否为10升？假设容量的分布为正态分布。（<img width="187" height="19" title="202010101602321091118062159.png" style="width: 187px; height: 19px;" alt="10.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/10/202010101602321091118062159.png"/>）

A.
61.[问答题] 设工厂甲、乙、丙三个车间生产同一种产品，产量依次占全厂产量的45%，35%，20%，且各车间的次品率分别为4%，2%，5%.求：
（1）从该厂生产的产品中任取1件，它是次品的概率；
（2）该件次品是由甲车间生产的概率.
A.
62.[问答题] 设某人群中患某种疾病的比例为20%.对该人群进行一种测试，若患病则测试结果一定为阳性；而未患病者中也有5%的测试结果呈阳性.求：
（1）测试结果呈阳性的概率；
（2）在测试结果呈阳性时，真正患病的概率.

A.
63.[问答题] 设总体X服从指数分布，其概率密度如下图所示，其中λ＞0为未知参数，x1, x2,…,xn为样本，求λ的极大似然估计。
<img width="178" height="48" title="202010061601972745750042956.png" style="width: 178px; height: 48px; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: sans-serif; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px;" alt="捕获.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2020/10/06/202010061601972745750042956.png"/>
A.
64.[问答题] 假设总体<img width="19" height="17" src="data:image/png;base64,R0lGODlhEwARAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAPAAsAhAAAAAAAAAAAHR0AHQAAMwAcSAAzWh1GbDMAADIAMjIyADNbgEgcAEgdHUceM0huf11/f2xGHX9/XX9uSG6AboBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwUwICCKQTmWwqimI3Ko8AvPQFQADQ0HwqOriB9MIRQlRISiaDLw0ZIjBg1hElF5TkAIADs="/>服从正态分布<img width="67" height="24" src="data:image/png;base64,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"/>，样本<img width="67" height="24" src="data:image/png;base64,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"/>来自总体<img width="19" height="17" src="data:image/png;base64,R0lGODlhEwARAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAPAAsAhAAAAAAAAAAAHR0AHQAAMwAcSAAzWh1GbDMAADIAMjIyADNbgEgcAEgdHUceM0huf11/f2xGHX9/XX9uSG6AboBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwUwICCKQTmWwqimI3Ko8AvPQFQADQ0HwqOriB9MIRQlRISiaDLw0ZIjBg1hElF5TkAIADs="/>，要使样本均值满足概率不等式<img width="153" height="25" src="data:image/png;base64,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"/>，求样本容量<img width="13" height="15" src="data:image/png;base64,R0lGODlhDQAPAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIABAAIAAcAhAAAAAAAAB0AABwcHB0dSAAcSAAzWh1GbDIAHTMAADIAMjNGbjNbgEgcAEgdHVozAFszM0hbSFl/WUhuf11/f2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwUfICAEDNAEBwAoAKKqGQC9E/AML6Emb/X+LlVKJVCFAAA7"/>最少应取多大? <img width="224" height="21" src="data:image/png;base64,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"/>
A.

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21秋西南大学1152 概率论与数理统计在线作业题目