2022年4月福师《概率论》考前模拟题答案百分
1.[单选题] 掷骰子一次,则点数大于3的概率为(? ).A.1/2
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B.1/3
C.1/4
D.1/6
答:——A——
2.[单选题] 设A,B为两个随机事件,且<img id="PIjcekvitem20210719052457095.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIjcekvitem20210719052457095.png?Expires=1942046697&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VdHlXpNF7jA2mxEBezol4VacVUc%3D" />,则AB=(? ).
A.A
B.B
C.<img id="PIscuhqitem20210719052457336.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIscuhqitem20210719052457336.png?Expires=1942046697&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=A6SaGMjbxIZkdhdPYQcgIOaRLEc%3D" />
D.<img id="PIfvafyitem20210719052457507.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIfvafyitem20210719052457507.png?Expires=1942046696&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=auaK%2B27%2FDjIsDvquo2pslFqfIec%3D" />
答:——A——
3.[单选题] 设A,B为两事件,则P(A<img id="PIrcbjgitem20210719052457699.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrcbjgitem20210719052457699.png?Expires=1942046697&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Y8403fF0sC6UfVGiPvOqIsBX0wM%3D" />B)=(? ).
A.P(A)<img id="PIqtvmyitem20210719052457871.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIqtvmyitem20210719052457871.png?Expires=1942046697&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=EYlwLKC90wSPqi5jVeQx0RVn5xI%3D" />P(B)
B.P(A)<img id="PIpejjnitem20210719052458031.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIpejjnitem20210719052458031.png?Expires=1942046697&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=87bmQCoShLcAd9swozCR8gesW9E%3D" />P(B)+P(AB)
C.P(A)<img id="PIavsjhitem20210719052457443.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIavsjhitem20210719052457443.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=gDJTuIyrp%2FHG2QJRE7c%2FQ2p7pTU%3D" />P(AB)
D.P(A) +P(B)<img id="PIwsrdvitem20210719052458328.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIwsrdvitem20210719052458328.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Pzgck61N3LxrfoJA0sOCz7VgLoU%3D" />P(AB)
答:——C——
4.[单选题] 已知<img id="PIwsztxitem20210719052458478.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIwsztxitem20210719052458478.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TOb8%2Bf3j9IEpZcKMsNJaYnFAGkQ%3D" />,则c=(? ).
A.<img id="PItdwhritem20210719052458688.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PItdwhritem20210719052458688.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ozYLLE2%2B%2FfMBMC4vKR7XQZnWh8Y%3D" />
B.<img id="PIptrwqitem20210719052458879.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIptrwqitem20210719052458879.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=urV%2BIzsEJMNCJF%2BRh5gNAd98iIs%3D" />
C.<img id="PIrogofitem20210719052459028.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrogofitem20210719052459028.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=vfzrKrAia1PvMRvEJvkaiHfUdg0%3D" />
D.<img id="PIzpnomitem20210719052459195.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIzpnomitem20210719052459195.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zUQyLlfrcBwqJ6yVDTFB%2F7BU%2BGE%3D" />
答:————
5.[单选题] 任取一个数,则该数的平方的末位数是1的概率为(? ).
A.0.1
B.0.2
C.0.3
D.0.4
答:————
6.[单选题] 设A,B,C为随机事件,则事件“A,B,C都不发生”可表示为( )
A.QUOTE <img id="PItyphcitem20210719052458270.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PItyphcitem20210719052458270.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YIsDDeFMMdRJXfbX3OkXXdSqzvM%3D" /> <img id="PIiqufxitem20210719052459468.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIiqufxitem20210719052459468.png?Expires=1942046698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=chRvhrKsP29HofNw70Tbx9MVX00%3D" />
B.QUOTE <img id="PImrttxitem20210719052459637.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImrttxitem20210719052459637.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=hH3UnHCgMse9J7sAFQtAa2yP6UY%3D" /> <img id="PIklxxbitem20210719052458697.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIklxxbitem20210719052458697.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=eWulKiysPGcw39A4%2Fq%2B%2FJrLoS60%3D" />
C.ABC
D.QUOTE <img id="PIlvjseitem20210719052458868.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIlvjseitem20210719052458868.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2FDEtr7QCwZlozbDm%2FDs2vQQmix4%3D" /> <img id="PIjdapbitem20210719052500153.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIjdapbitem20210719052500153.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TRWreS8al%2B7m5tvtAFKHtppdQjk%3D" />
答:————
7.[单选题] 若A与B独立,且P(A)=0.3,P(B)=0.5,则<img id="PIoqhtbitem20210719052500274.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIoqhtbitem20210719052500274.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=KJD9O5r6ZDmos%2BWbbUlcSjb6o6c%3D" />( ). <br><img id="PIlhbmxitem20210719052459666.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIlhbmxitem20210719052459666.png?Expires=1942046699&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=C4Gn0u7Cs4pKsYFltMkiQ3YOEM0%3D" />
A.A
B.B
C.C
D.D
答:————
8.[单选题] 下列各式中,( )是正确的。
A.<img id="PIvhvjhitem20210719052500496.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIvhvjhitem20210719052500496.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=pl9z%2Fxc9pQTjT0IsP5JXZ5ucPMk%3D" />
B.<img id="PIvsubwitem20210719052500686.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIvsubwitem20210719052500686.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=PaX%2B1KirTkGISbu87kO2cp8Gd44%3D" />
C.<img id="PIzmhdritem20210719052500800.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIzmhdritem20210719052500800.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=eEVp%2FouxaLyvVfPARGR3u6h5ZFw%3D" />
D.<img id="PImnmioitem20210719052500358.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImnmioitem20210719052500358.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2FoAnN13IffAg79p27QeLGc4wtNc%3D" />
答:————
9.[单选题] ( )是正确的.
A.<img id="PIznkositem20210719052501285.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIznkositem20210719052501285.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=avF2EcKjwdrS0sh4E3q%2FHbWJTzg%3D" />
B.<img id="PIbakbbitem20210719052501429.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIbakbbitem20210719052501429.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=V0LLmdxNwpoWnJgtvSoSTKGFP%2Fs%3D" />
C.<img id="PIhzfbnitem20210719052501563.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIhzfbnitem20210719052501563.png?Expires=1942046700&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=fdZwWks0ZtuiaDXRIiXi8EAHCR8%3D" />
D.<img id="PImbbkjitem20210719052501764.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImbbkjitem20210719052501764.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=LJAJSHRn9JmuTdF9LoJbnOfYdlg%3D" />
答:————
10.[单选题] 设f(x)在区间上等于sinx,而在此区间外等于0,若f(x)可以做为某连续随机变量X的密度函数,则区间为( )
A.<img id="PIdcoisitem20210719052501879.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdcoisitem20210719052501879.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=f0ou0l5F648tGOa13mdN2pfSj2A%3D" />
B.<img id="PIpnvnnitem20210719052502053.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIpnvnnitem20210719052502053.png?Expires=1942046702&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=4V2NveeFH%2Fc8gkS3j9ISw%2BqrRts%3D" />
C.<img id="PIinecoitem20210719052502228.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIinecoitem20210719052502228.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=7emxE2cn%2F3LeDR6eu7SuM%2BlXiSU%3D" />
D.<img id="PIhtmsmitem20210719052501227.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIhtmsmitem20210719052501227.png?Expires=1942046702&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=dBVvRMtjWDhbvRapNgtZeDd%2BgN0%3D" />
答:————
11.[单选题] <img id="PIoleswitem20210719052502468.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIoleswitem20210719052502468.png?Expires=1942046701&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=iUQqz7ocxG17hk3uNmoX3g0XeEg%3D" />,则<img id="PIdavktitem20210719052501534.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdavktitem20210719052501534.png?Expires=1942046702&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HdY8ncX9w1ilBnAWE3EUlq2lLKM%3D" />
A.1
B.2
C.0.5
D.4
答:————
12.[单选题] 在n次试验中,随机事件A,B发生的频率分别为0.5和0.3,且A,B互不相容,则在n次试验中事件A<img id="PIhyrlditem20210719052502783.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIhyrlditem20210719052502783.png?Expires=1942046702&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=aJR%2FRdkl9q6xIK6qHD69EiK931I%3D" />B发生的频率为(? ).<br><img id="PIymxrlitem20210719052502214.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIymxrlitem20210719052502214.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=WIeJ%2FOa593rCm0PqFF%2BB4ivKMDM%3D" />
A.A
B.B
C.C
D.D
答:————
13.[单选题] 设A,B为两个随机事件,且<img id="PIbxfagitem20210719052502049.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIbxfagitem20210719052502049.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=yKeG0JgoWrChnnyeSxqQwlKNW3A%3D" />,则P(A|B)=( )
A.1
B.P(A)
C.P(B)
D.P(AB)
答:————
14.[单选题] 若X服从<img id="PIxurbnitem20210719052503418.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIxurbnitem20210719052503418.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=PvLb6uLzKigv%2BOoeKZggeiw8rTI%3D" />,则<img id="PIdtumxitem20210719052503591.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdtumxitem20210719052503591.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=NygKsayTOUdmLSoJ0AKpdd5aOwE%3D" /><br> <img id="PIhtkziitem20210719052503012.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIhtkziitem20210719052503012.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=5AUnYzNLrwrosa3w9VRuzDXRO0A%3D" />
A.A
B.B
C.C
D.D
答:————
15.[单选题] <img id="PIkzaymitem20210719052503088.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkzaymitem20210719052503088.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ELkBMezVw7TNBB8iKBrAQtAPX8Y%3D" />的对立事件是(? ).<br><img id="PIpbqjnitem20210719052503692.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIpbqjnitem20210719052503692.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=q53QpymkBYg%2Bk1yOaNxynwaql5k%3D" />
A.A
B.B
C.C
D.D
答:————
16.[单选题] 事件A={1,2,3},B={2,7,4},则AB= (? ).<br><img id="PIlgsaqitem20210719052503593.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIlgsaqitem20210719052503593.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=obGLh26dk50KaelZrEnDlkRi9Rg%3D" />
A.A
B.B
C.C
D.D
答:————
17.[单选题] 事件A={1,2,3},B={2,7,4},则A-B= (? ).<br><img id="PImtfinitem20210719052505043.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImtfinitem20210719052505043.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=6xakd3fhL3v9LZ%2BM%2Bet77S7OT9A%3D" />
A.A
B.B
C.C
D.D
答:————
18.[单选题] 事件AB的对立事件是(? ).<br><img id="PIjvpwpitem20210719052504472.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIjvpwpitem20210719052504472.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=UEHUWKlX4cJ5C3Kfa2hliQ%2BGJmM%3D" />
A.A
B.B
C.C
D.D
答:————
19.[单选题] 随机事件A在10次试验中出现5次,则A发生的频率为(? ).<br><img id="PIwcqveitem20210719052505421.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIwcqveitem20210719052505421.png?Expires=1942046702&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=QKfmKkN3NII6H1D55z6nQpIPpMs%3D" />
A.A
B.B
C.C
D.D
答:————
20.[单选题] 从0到9这10个数中,任取一个数,则该数是偶数的概率为(? ).
A.0.1
B.0.5
C.0.4
D.0.6
答:————
21.[单选题] 从0到9这10个数中,任取一个数,则该数能被3整除的概率为(? ).
A.0.1
B.0.5
C.0.4
D.0.6
答:————
22.[单选题] 若X服从<img id="PIvejxbitem20210719052504536.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIvejxbitem20210719052504536.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=xL0yXdId97f3SMUhg9vMVYgwUzk%3D" />,则<img id="PItkbxwitem20210719052502651.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PItkbxwitem20210719052502651.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=t1ic9jIwnQDAjLKspZpyGOZ59P0%3D" /> <br><img id="PIqbrjvitem20210719052505981.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIqbrjvitem20210719052505981.png?Expires=1942046706&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=2Iy5z8SVcnBsQ1F4KkQ47FdtB5I%3D" />
A.A
B.B
C.C
D.D
答:————
23.[单选题] 若X服从<img id="PIddngsitem20210719052505034.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIddngsitem20210719052505034.png?Expires=1942046706&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=XyiADLgDC2DrTJ93SjNMu%2FIvu%2FY%3D" />,则<img id="PIhlrpgitem20210719052505505.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIhlrpgitem20210719052505505.png?Expires=1942046706&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=0PJYoVzDYbr%2Bn4YQXsJV85ApS0c%3D" /><br> <img id="PIrxcrditem20210719052506391.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrxcrditem20210719052506391.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=DluSUtOzOZYiI3MPj7jtRfNkLQo%3D" />
A.A
B.B
C.C
D.D
答:————
24.[单选题] 若<img id="PIiwgngitem20210719052506552.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIiwgngitem20210719052506552.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8aIQE9T%2FHfh%2Bhmp1BcA4urEo%2BD4%3D" />, 则<img id="PIkuiqvitem20210719052503494.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkuiqvitem20210719052503494.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=lznn%2B9hysP9B%2FkOjV0WtBhlMpfw%3D" /><br><img id="PIsvznritem20210719052506802.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIsvznritem20210719052506802.png?Expires=1942046703&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Bt1DvgV1GLX2cgYpxTZ4RCoSBXg%3D" />
A.A
B.B
C.C
D.D
答:————
25.[单选题] 设随机事件A={1,2,3,4,5},B={2,4,5},则事件AB为( ).
A.{2,4,5}
B.{2,5}
C.{3}
D.{2,4 }
答:————
26.[单选题] 在盒子中有10个相同的球,分别标有1,2,…,10,从中任取一球,则此球的号码为偶数的概率为( ).
A.0.1
B.0.3
C.0.5
D.0.7
答:————
27.[单选题] 若事件A,B独立,P(A)=0.5,PB.=0.6,则P(AB)= ( )。
A.0.1
B.0.3
C.0.5
D.0.7
答:———— 天津大学答案无忧答案网整理
28.[单选题] 若随机变量X~N(0,1),则EX= ( )。
A.0
B.0.3
C.0.5
D.1
答:————
29.[单选题] 若随机变量X的数学期望EX=3,则E(X+3)=( )。
A.0
B.3
C.6
D.9
答:————
30.[单选题] 若随机变量X的分布函数为F(x),则<img id="PItgkaqitem20210719052506230.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PItgkaqitem20210719052506230.png?Expires=1942046706&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=vXMabpEUQOOUb31trMvNA0fRmUQ%3D" />( )。
A.0
B.0.3
C.0.5
D.1
答:————
31.[单选题] 若随机变量X的密度函数为f(x), 则<img id="PIabpqbitem20210719052507138.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIabpqbitem20210719052507138.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=9a34vfnGNyLanIdVrXZI3TTK7IM%3D" />( )。
A.0
B.0.3
C.0.5
D.1
答:————
32.[单选题] 若随机变量X,Y不相关,则它们的相关系数为( )。
A.0
B.0.3
C.0.5
D.1
答:————
33.[单选题] 若X服从<img id="PIemrggitem20210719052507258.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIemrggitem20210719052507258.png?Expires=1942046707&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=RQIE3g%2Bs1pKQPhjhm8iwGNjenRI%3D" />,<img id="PImgpucitem20210719052507402.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImgpucitem20210719052507402.png?Expires=1942046704&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=LWI8627lhbWQGDyooZV5%2FTSjz0s%3D" />则<img id="PIijsvditem20210719052507789.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIijsvditem20210719052507789.png?Expires=1942046707&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=N9mMb2Ngf4n1uE%2FBzSL7UCpqeao%3D" /><br><img id="PIkprypitem20210719052507897.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkprypitem20210719052507897.png?Expires=1942046706&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=I1O5RQymkds4wMnK3QYdTCHMGFA%3D" />
A.A
B.B
C.C
D.D
答:————
34.[单选题] X与Y相互独立,其方差分别为6和3,则<img id="PIkghsjitem20210719052508048.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkghsjitem20210719052508048.png?Expires=1942046708&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=5HO7dALXlnRc1VGklaekN0jJLxQ%3D" />( ).
A.9
B.15
C.18
D.27
答:————
35.[填空题] 假设一批产品中一、二、三等品各占60%,30%,10%,从中随意取出一件,结果不是三等品,则取到的是一等品的概率为 ## 。
答:————
36.[填空题] 设随机变量X和Y独立同分布,且<img id="PImxhgcitem20210719052508150.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImxhgcitem20210719052508150.png?Expires=1942046708&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VkLZGUAzi3l9%2Bgr207vqF0%2FK2HU%3D" />,则<img id="PIybxcditem20210719052508360.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIybxcditem20210719052508360.png?Expires=1942046707&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=O3z0vYeFcSJNDnIg%2B57VI7w97BA%3D" /><span style="text-decoration: underline;"> ## </span> 。
答:————
37.[填空题] 设随机变量<img id="PIrqeyiitem20210719052508547.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrqeyiitem20210719052508547.png?Expires=1942046705&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=1VsucM1ZI6BIrFQyP457iQ2UPq8%3D" />和<img id="PIuzaymitem20210719052508704.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIuzaymitem20210719052508704.png?Expires=1942046708&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=a4LBEf5j%2FC5uKxLdV%2FIaD7Guftg%3D" />独立同分布,均服从二项分布<img id="PIcukucitem20210719052507864.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIcukucitem20210719052507864.png?Expires=1942046708&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SOGznPubs8kneLfvJ9DDWej%2Fx48%3D" />。则<img id="PIdhwxiitem20210719052509156.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdhwxiitem20210719052509156.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zA6Rn6GnriQQC1dmRUxi8mNwjvE%3D" />与<img id="PIetxxyitem20210719052509311.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIetxxyitem20210719052509311.png?Expires=1942046708&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=63XhgQnPjLvc8PDmhziz8ZK9I5c%3D" />的相关系数<img id="PIcahhoitem20210719052506284.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIcahhoitem20210719052506284.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=V%2BH%2Bf%2FXbgJ9LxvbPoBTgC2fHDkU%3D" /><span style="text-decoration: underline;"> ## </span> 。
答:————
38.[填空题] 设随机变量<img id="PIfoimvitem20210719052509617.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIfoimvitem20210719052509617.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=DjHOkh2Dh%2BNVM089%2BBfHNrCQe0o%3D" />独立,<img id="PIbjnzcitem20210719052509758.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIbjnzcitem20210719052509758.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=sINNLeCLaXLWZ62%2BDUvca2mMTqs%3D" />服从指数分布,且<img id="PIeugncitem20210719052509234.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIeugncitem20210719052509234.png?Expires=1942046710&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ead40ASyktbNRfRBbOhdHJma%2FFc%3D" />则<img id="PItgfgqitem20210719052506957.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PItgfgqitem20210719052506957.png?Expires=1942046707&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zN3fFJZnfhJ6ez%2B%2FHEdDk6GXSoc%3D" /><span style="text-decoration: underline;"> ## </span>.
答:————
39.[填空题] 设随机变量X的概率密度函数为<img id="PIudspditem20210719052507314.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIudspditem20210719052507314.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=NirsaYBgDSaQEgyCQ2dUOUpdCv4%3D" />,则常数c=<span style="text-decoration: underline;"></span><span style="text-decoration: underline;">##</span><span style="text-decoration: underline;"> </span>。
答:————
40.[填空题] 甲、乙两人投篮,投中的概率分别为0.6,0.7,今各投3次,则两人投中次数相等的概率是 ##
答:————
41.[填空题] 独立地从 (0, 6) 区间内任取3个数,则所取的3个数至少有2个不大于5的概率 p = ## 。
答:————
42.[填空题] 设随机变量<img id="PIrmxqeitem20210719052510789.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrmxqeitem20210719052510789.png?Expires=1942046710&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VGKDzXDV8TKLX4LpMmoj6j562%2BA%3D" />且<img id="PIdwluoitem20210719052510952.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdwluoitem20210719052510952.png?Expires=1942046707&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=nBDEX56yCWmKnBh7bNaBPlgo8xs%3D" />,则<img id="PIkpmguitem20210719052510380.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkpmguitem20210719052510380.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=7CbTOQ%2FzeD8%2BU88c0jWeByNtV%2Fc%3D" /><span style="text-decoration: underline;">##</span>。
答:————
43.[填空题] 向同一目标射击,假设每次命中的概率为0.5,则射击3次,至少有1次命中目标的概率为 ##。
答:————
44.[填空题] 若P(AB)=0.4,P(A)=0.8,则P(B|A)= ## 。
答:————
45.[填空题] 已知<img id="PIxiatwitem20210719052511273.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIxiatwitem20210719052511273.png?Expires=1942046710&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=khAP9%2FhbL2mWUyThkMkmwtvILSc%3D" />,则<img id="PIojcglitem20210719052511414.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIojcglitem20210719052511414.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Suhu%2FuFW192ucxTIJ8JwqzTgYgg%3D" /><span style="text-decoration: underline;">## </span>
答:————
46.[填空题] 设随机变量<img id="PIlcreqitem20210719052511557.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIlcreqitem20210719052511557.png?Expires=1942046710&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zoheGasr6IhJNCX%2FRTJbyzpSRhw%3D" />且<img id="PIoumlpitem20210719052511703.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIoumlpitem20210719052511703.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=I3iQMezjkMMnbUKbANeWnKL8P9w%3D" />,则<img id="PIdazaxitem20210719052510738.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIdazaxitem20210719052510738.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YnnJ1htGIyVyEM%2F4OjtShKvSzjM%3D" /><span style="text-decoration: underline;">## </span>。
答:————
47.[填空题] 设随机变量<img id="PIacorxitem20210719052512017.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIacorxitem20210719052512017.png?Expires=1942046710&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=rYyyP%2F1NBq5LQCImH3UpnroZfFQ%3D" />在(1,6)服从均匀分布,则方程<img id="PIkdsacitem20210719052511369.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIkdsacitem20210719052511369.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TzW3CFoezADVt06BZ33aPt7TpyU%3D" />有实根的概率为<span style="text-decoration: underline;"> ## </span>。
答:————
48.[填空题] 设随机变量X<img id="PIpxotsitem20210719052512190.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIpxotsitem20210719052512190.png?Expires=1942046709&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zwVxK8LHy122QvHrLqUbYJVRW%2Fg%3D" />,则E(X)=____<span style="text-decoration: underline;">##</span>__.
答:————
49.[填空题] 一个袋子中有3 个白球,2个红球,从中不放回地取球,每次取一个球 ,则第3次取到白球的概率为 ## 。
答:————
50.[填空题] 一个袋子中有3 个白球,2个红球,从中有放回地取球,每次取一个球 ,则第3次取到白球的概率为## 。
答:————
51.[填空题] 向同一目标射击,假设每次命中的概率为0.5,则射击3次,恰有1次命中目标的概率为## 。
答:————
52.[填空题] 一个袋子中有3个红球,7个白球,每次抽取一个,现从中取三次球,则第三次取到白球的概率为 ## 。
答:————
53.[填空题] 设随机事件A={1,2,3,4,5},B={6},则P(AB)= ## 。
答:————
54.[填空题] 在盒子中有10个相同的球,分别标有1,2,…,10,从中任取一球,则此球的号码为奇数的概率为 ## 。
答:————
55.[填空题] 若事件A,B互不相容 ,P(A)=0.5,P(B)=0.6,则P(AB)=## 。
答:————
56.[填空题] 若随机变量X~N(0,1),则DX= ## 。
答:————
57.[填空题] 若随机变量X的数学期望EX=3,则E(2X+3)= ## 。
答:————
58.[填空题] 若随机变量X的分布函数为F(x),则<img id="PIiseafitem20210719052509254.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIiseafitem20210719052509254.png?Expires=1942046711&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=PXIVC6sohg2ZD%2FVefx%2BLOs8FTck%3D" /><span style="text-decoration: underline;"></span><span style="text-decoration: underline;">##</span><span style="text-decoration: underline;"> </span>。
答:————
59.[问答题] 设有一架长机两架僚机飞往某目的地进行轰炸,由于只有长机装有导航设备,因此僚机不能单独到达目的地,在飞行途中要经过敌方高射炮阵地,每机被击落的概率为0.2,到达目的地后,各机独立轰炸,每机炸中目标的概率为0.3,求目标被炸中的概率。
答:————
60.[问答题] 设X,Y相互独立同分布,且<img id="PImjjleitem20210719052512879.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PImjjleitem20210719052512879.png?Expires=1942046713&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=kht8dZZ75ajo%2FFYl2P%2BSyYSzv8M%3D" />,<img id="PIltfftitem20210719052512643.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIltfftitem20210719052512643.png?Expires=1942046713&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=G1ev3UF3MyRemZDdFqgjHJwbw04%3D" />.<br>求:(1)<img id="PIrcbccitem20210719052513841.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIrcbccitem20210719052513841.png?Expires=1942046712&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2FhAcjTr6wjY9W%2BFTHvN7RAq85WY%3D" />(2)<img id="PIlsrspitem20210719052513280.png" src="https://oescdn.open.com.cn/zyglpt/PI/item/2021/0719/PIlsrspitem20210719052513280.png?Expires=1942046714&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=j4JLWjx73K71QbMIy%2B%2FM4P3b1vQ%3D" />
答:————
61.[问答题] 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,并假定中靶与否是相互独立的.求:(1)两人都中靶的概率;(2)甲击中而乙不击中的概率;(3)甲不中乙中的概率.
答:————
62.[问答题] 若随机变量X服从二项分布b(k;n,p),且EX=5,DX=2.5,求n,p的值 。
答:————
63.[问答题] 一个机床有1/3的时间加工零件A,其余时间加工零件B。加工零件A时停机的概率是0.3,加工零件B时停机的概率是0.4。求(1)该机床停机的概率;(2)若该机床已停机,求它是在加工零件A时发生停机的概率。
答:————
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