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9100
1、设随机变量X服从参数为2的泊松分布，由切比雪夫不等式有<imgwidth="93"height="27"src="data:image/png;base64,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"/>().
底部附件就是答案，需要可以下载
A.≤7/8 B.≤1/8 ≥1/8 ≥7/8
参考答案：B.≤1/8；
2、对正态总体的均值
C.前三个选项都不正确
可能接受原假设也可能拒绝原假设
必拒绝原假设
必接受原假设
参考答案：可能接受原假设也可能拒绝原假设；
3、X为连续型随机变量，a为一常数，则P(X=a)的值()。
必为零
不一定为零
可能不为零
必不为零
参考答案：必为零；
4、描述连续型随机变量概率分布情况的是（）。
分布列
分布表
密度函数
相关系数
5、甲、乙两人射击，甲击中的概率为0.8，乙击中的概率为0.7，两人同时射击，并假定中靶与否是独立的。则两人都中靶的概率为（）。
0.06
0.14
0.24
0.56
6、事件A与B独立，则（）.
P(AB)=P(A)P(B)
P(A∪B)=1
P(AB)=0
P(A|B)=P(A)
7、向目标独立地射击10次,每次射击中靶的概率为0.7,用随机变量X表示命中的次数,则X服从()分布.
二项
几何
均匀
超几何
8、设A与B为两个随机事件，且P（A）=0.3，P（B）=0.5，若A与B互不相容，则P（A∪B）=().
0.8
0.65
0.2
0.15
9、设A、B为二事件，若P(AB)=0,则（）。
与B互不相容
A与B独立
P(A)=0或P(B)=0
P(A-B)=P(A)
10、设随机变量为X与Y，已知DX=25,DY=36,相关系数ρ=0.4,则D(X-Y)=().
85
61
11
37
11、服从（）分布的随机变量为连续型随机变量。
二项
均匀
两点
几何
12、一部四卷的文集随意摆放到书架上，则恰好各卷自左向右或自右向左的卷号为1，2，3，4的概率为（）。
D.1/24
E.1/12
F.1/6
1/3
13、设事件<imgwidth="15"height="15"src="data:image/png;base64,R0lGODlhDwAPAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMAAgAKAAoAhAAAAAAAAAgGCwoEAAMGCwsGAwMDAwQIDQ0KCAQGCwQDCAsLCwgDAwgKDQoEBAoLDQ0LCw0IBA0LCgAABAMECgMDCAsLDQADCAAAAwECAwECAwECAwECAwECAwECAwECAwUwICCOgCSQ5ECgYmEcLJIMMCkpC9OgzgPppEhgOHmMEBQRomJRMkWRS3MQwOyogWIIADs="/>、<imgwidth="15"height="15"src="data:image/png;base64,R0lGODlhDwAPAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAgAKAAoAhAAAAAAAAAgDAA0LCwADCAsLDQoEAAQIDQ0LCgQAAAMGCwgDAwgKDQAECg0KCAMDCAsGAwAABAoLDQMAAAQDCA0IBAAAAwECAwECAwECAwECAwECAwECAwECAwECAwECAwU0IAAMQmAGRCGKxgEgibIOC8M2q/OoUCStkJNsVgM4JsMXRQUwpESVpFNFszUDruMpYLGGAAA7"/>的概率均大于零，且<imgwidth="15"height="16"src="data:image/png;base64,R0lGODlhDwAQAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwALAAoAhAAAAAAAAAgGCw0LCwgDAAMGCwsGAw0LCgQIDQ0KCAQGCgQDCAsLCgQAAwgKDQoEBAoLDQMABAAABAQGCw0IBAADCAsLDQMDCAAAAwECAwECAwECAwECAwECAwECAwECAwU0ICCO4iGQ5EAU6GgESAskChGjx8I0TvtAiQgE9QoEJMNRYiKiVCzKCxRgeAJUAYwDe4SEAAA7"/>与<imgwidth="15"height="15"src="data:image/png;base64,R0lGODlhDwAPAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAgAKAAoAhAAAAAAAAAgDAA0LCwADCAsLDQoEAAQIDQ0LCgQAAAMGCwgDAwgKDQAECg0KCAMDCAsGAwAABAoLDQMAAAQDCA0IBAAAAwECAwECAwECAwECAwECAwECAwECAwECAwECAwU0IAAMQmAGRCGKxgEgibIOC8M2q/OoUCStkJNsVgM4JsMXRQUwpESVpFNFszUDruMpYLGGAAA7"/>互为逆事件，则有（ ）
A与B相互独立
A与B的对立事件相互独立
A的对立事件与B的对立事件相互独立
A与B互不相容
14、将一颗骰子抛掷4次，则“出现的4个数字全同”的概率为<imgwidth="23"height="41"src="data:image/png;base64,R0lGODlhFwApAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAARACIAhAAAAAAAAAgDAAADCAsLDQ0LCgQAAA0LCwsGAwoEAAAAAwgKDQ0KCAMAAAMGCw0KCwQDCAgIDQAABAoLDQAECggDBAoGCAQIDQMGCA0IBAMDCAMAAwECAwECAwECAwECAwV+ICCOhzAQY6oWRnCq8Ii8MTyjtXrnOs2Lux/Q9wsKE8QaKxBQLITQqHRKrY6Y2KwWa+2qGI2AA/ogFCA4ISNSQwQkE1EiQIGx4KpDJT5i1WMWaQAJeClzARcpLBgthTUZARoTJY4wGYWQiY+FLJoxnSIMG085CHgJfzyHqTEhADs="/>.
A.√
B.×
15、已知<imgwidth="72"height="21"src="data:image/png;base64,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"/>则<imgwidth="116"height="21"src="data:image/png;base64,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"/>=0
A.√
B.×
16、已知电子管的寿命X(小时)服从参数<imgwidth="64"height="41"src="data:image/png;base64,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"/>的指数分布，则这电子管使用在1000小时以上的概率为<imgwidth="15"height="41"src="data:image/png;base64,R0lGODlhDwApAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAJACIAhAAAAAAAAAgDAAADCAsLDQ0LCgQAAA0LCwsGAwoEAAAAAwgKDQMGCwAECg0IBAAABAoLDQ0KCAMAAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwVKIAAcwkCIYmEEJooirQvAp0zLc+zetv76ooRPFQgoFrikcslsyorQqHNKrVqppCIDpdreSI3gFuA4qsIiRPEBcTnYgIgEORIUYyEAOw=="/>.
A.√
B.×
17、已知<imgwidth="72"height="21"src="data:image/png;base64,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"/>则<imgwidth="115"height="21"src="data:image/png;base64,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"/>=0
A.√
B.×
18、假设X，Y为二随机变量，且D（X＋Y）＝7，D（X）＝4，D（Y）＝1，则Cov(X,Y)=1
A.√
B.×
19、X～N(5,4),则P(3<X<7)=0.6826.
A.√
B.×
20、X为连续型随机变量，F(x)为其分布函数，则P(a<X<b)=F(b)-F(a)。
A.√
B.×
21、设两个相互独立的随机变量X，Y的方差分别是4和2，则<imgwidth="83"height="21"src="data:image/png;base64,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"/>=44
A.√
B.×
22、加工一产品要经过三道工序，第一、二、三道工序出废品的概率分别为0.10，0.05，0.20，若假定各工序是否出废品为独立的，则经过三道工序而不出废品的概率为0.999.
A.√
B.×
23、X～U(1,5),则P(0<X<2)=1/4.
A.√
B.×
24、假设检验的结论一定是正确的。 西南大学作业答案
A.√
B.×
25、X服从参数为4的泊松分布P(4)，则EX=4.
A.√
B.×
26、X～N(3,4),则P(X<3)=P(x>3).<!--3)=--><!--3)=--><!--3)=-->
A.√
B.×
27、F(x)为随机变量X的分布函数，则当a<b时，有F(a)≤F(b).
A.√
B.×
28、设A、B为两个事件，P(A∪B)=1
A.√
B.×
29、连续型随机变量均有方差存在。
A.√
B.×
30、随机变量X的方差DX也称为X的二阶原点矩。
A.√
B.×
31、从1，2，3，4，5，6这六个数中随机的、有放回的连续抽取4个，则“取到的4个数字完全不同”的概率为5/18.
A.√
B.×
32、随机变量X、Y独立，则X与Y必不相关。
A.√
B.×
33、随机变量X的取值为有限或可列无穷多，则X必为离散型随机变量。
A.√
B.×
34、设有编号为1,…,30的准考证，一学生任意抽一张考试，则该生“抽到前10号准考证”的概率为1/3.
A.√
B.×
35、随机变量X的取值为不可列无穷多，则X必为连续型随机变量.
A.√
B.×
36、设事件为A、B，已知P(AB)=0，则A与B互不相容.
A.√
B.×
37、设事件为A、B，已知P(AB)=0，则A与B必相互独立.
A.√
B.×
38、A.B为任意二随机事件，则P(A∪B)=P(A)+P(B).
A.√
B.×
39、“ABC”表示三事件A、B、C至少有一个发生.
A.√
B.×
40、设X1，X2，X3为来自总体X的容量为3的样本，则<imgwidth="157"height="41"src="data:image/png;base64,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"/>是总体期望<imgwidth="16"height="17"src="data:image/png;base64,R0lGODlhEAARAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAgAMAAsAhAAAAAAAAAMAAwgKDQsGAwADCAsLDQ0LCwgDAAMGCwMAAA0IBA0KCAsLCgQECgsGBAMDAAAECgAABAoLDQ0LCgQDCAQIDQECAwECAwECAwECAwECAwECAwECAwECAwECAwU3ICACjDCIRGGMQLoeSMLCMmmy5dmqrAvQs5goh1PIFoFCwzF6QAKBCCEgmYgolRWrF9kGLd5RCAA7"/>的无偏估计。
A.√
B.×
41、随机变量X服从参数为1的泊松分布，求：<imgwidth="108"height="24"src="data:image/png;base64,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"/>=3
A.√
B.×
42、编有号码1，…，10的十个纪念章装于袋中，现从中任取三个，则取到的三个纪念章号码大小在中间是5的概率为<imgwidth="16"height="41"src="data:image/png;base64,R0lGODlhEAApAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAJACIAhAAAAAAAAAgDAAADCAsLDQ0LCgQAAA0LCwsGAwoEAAAAAwgKDQAABAoLDQAECgMGCA0IBAMDCAQIDQ0KCAMAAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwVWIAAcwkCIYmEEJooirQvAp0zLc+zetv76ooRPFQgoFrikcslsyorQqHNKbSICjAZKlXWpHLhE12t4rMaQQKRB6kLQAQngrQWo5HfRhIKcdRNgKAlFgSEAOw=="/>.
A.√
B.×
43、随机地从一批电池中抽取15只，测得失效时间（小时）为115、119、131、138、142、147、148、155、158、159、163、166、167、170、172，可算得其样本均值为160（小时），样本标准差为20（小时）。
A.√
B.×
44、随机变量X服从参数为1的泊松分布，<imgwidth="73"height="21"src="data:image/png;base64,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"/>=1
A.√
B.×
45、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053701822033561.png"title="201809041536053701822033561.png"alt="910020181219.png"/>
46、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053647148055321.png"title="201809041536053647148055321.png"alt="910020181215.png"/>
47、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053009879062878.png"title="201809041536053009879062878.png"alt="910020181201.png"/>
48、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053333170022040.png"title="201809041536053333170022040.png"alt="910020181208.png"/>
49、设随机变量X的密度函数为<imgwidth="161"height="51"src="data:image/png;base64,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"/>求常数c.
50、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053299110074278.png"title="201809041536053299110074278.png"alt="910020181206.png"/>
51、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053724868031251.png"title="201809041536053724868031251.png"alt="910020181221.png"/>
52、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053366017019373.png"title="201809041536053366017019373.png"alt="910020181210.png"/>
53、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/2018/09/05/201809051536121826810047697.png"title="201809051536121826810047697.png"alt="910020181229.png"/>
54、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201709071504747625255075575.png"title="201709071504747625255075575.png"alt="910041.png"/>
55、已知随机变量X的分布函数为（1）<imgwidth="239"height="48"src="data:image/png;base64,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"/>（2）<imgwidth="101"height="21"src="data:image/png;base64,R0lGODlhZQAVAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwBhAA4AhAAAAAAAAA0IBAAABAoLDQ0LCgQABAsGAwQIDQAAAwgKDQ0KCAMAAAAECg0LCwgDAAADCAsLDQQAAAMGCwMAAwgDBAQECgMABAoEAAsLCwgDAwQAAwQEAAMDCAECAwECAwX/ICAKQVkOhAgURioeJgLAQaKoeK7Tsg4sjFKD5fIZczwdUOZ4QCIAASonsIkKkslxKyVge8jYj3LbHrtf6nSGIuqaWkelaM41e4JnrmBRXuh1IncjeioYDYZPGFo+BxAZGmWBOQtkIpWSIyVgL4iTKpiXllcSPTAIBRuZOCRWn2ouaSpNJp6Xf69Ra7JRJgFTXUa8Phi+tSrBK6U+tGDDxcYBtrqxyyIYhSoHa3sGHNO51JcMnDmHKliMn8lLpOra3Ogt24CvoWOrrLbpuff+o6zirWiB7wg0Y7YGzcimQ4Aza9eiScOh0BEUAOd0pMqUDE44Vk+GUepw8QeuXHkiNKQBUoLhNUZYSmiJWSPfpyQAmjxhGYDhAXA3N03a+LHoUIJG+wFMyhQdxKZH60EN52YqgBAAOw=="/>（3）<imgwidth="209"height="41"src="data:image/png;base64,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"/>。<imgwidth="227"height="41"src="data:image/png;base64,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56、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053499448098642.png"title="201809041536053499448098642.png"alt="910020181225.png"/>
57、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053141045051397.png"title="201809041536053141045051397.png"alt="910020181203.png"/>
58、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/201809041536053672365049126.png"title="201809041536053672365049126.png"alt="910020181217.png"/>
59、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/2018/09/05/201809051536121791128012769.png"title="201809051536121791128012769.png"alt="910020181227.png"/>
60、<imgsrc="/resourcefile/uploadFiles/file/questionImgs/2018/09/05/201809051536121749437055848.png"title="201809051536121749437055848.png"alt="910020181231.png"/>
离线作业答案
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