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1、山東建筑大學(xué)試卷共3頁第1頁2008至2009第1學(xué)期課程名稱概率論與數(shù)理統(tǒng)計(jì)試卷(A)專業(yè):理工科各專業(yè)考試性質(zhì):閉卷考試時間120分鐘題號一二三四五六七八九總分分?jǐn)?shù)一、填空題(每題3分,共15分)1、已知隨機(jī)變量服從參數(shù)為2的泊松(Poisson)分布,且隨機(jī)變量,則____________.2、設(shè)、是隨機(jī)事件,,,則3、設(shè)二維隨機(jī)變量的分布列為12312若與相互獨(dú)立,則的值分別為。4、設(shè),則__________5、設(shè)是取自總體的樣本,則統(tǒng)計(jì)量服從__________分布.二、選擇題(每題3分,共15分)1.一盒產(chǎn)品中有
2、只正品,只次品,有放回地任取兩次,第二次取到正品的概率為【】(A);(B);(C);(D).2、設(shè)事件與互不相容,且,,則下面結(jié)論正確的是【】(A)與互不相容;(B);(C);(D).3、設(shè)兩個相互獨(dú)立的隨機(jī)變量與分別服從正態(tài)分布和,則【】(A);(B);(C);(D)。4、如果滿足,則必有【】(A)與獨(dú)立(B)與不相關(guān)(C)(D)5、設(shè)相互獨(dú)立的兩個隨機(jī)變量與具有同一分布律,且的分布律為01則隨機(jī)變量的分布律為【】(A);(B);(C);(D)。三、(本題滿分8分)兩臺機(jī)床加工同樣的零件,第一臺出現(xiàn)廢品的概率為0.03,第
3、二臺出現(xiàn)廢品的概率為0.02,已知第一臺加工的零件比第二臺加工的零件多一倍,加工出來的零件放在一起,求:任意取出的零件是合格品(A)的概率.···········································································································裝訂線·····················································································
4、·············班級______________姓名______________學(xué)號______________···········································································································裝訂線······························································································
5、····山東建筑大學(xué)試卷共3頁第2頁四、(本題滿分10分)將一枚硬幣連擲三次,X表示三次中出現(xiàn)正面的次數(shù),Y表示三次中出現(xiàn)正面次數(shù)與出現(xiàn)反面次數(shù)之差的絕對值,求:(1)(X,Y)的聯(lián)合概率分布;(2).五、(本題滿分12分)設(shè)隨機(jī)變量,,試求隨機(jī)變量的密度函數(shù).六、(本題滿分10分)設(shè)的密度函數(shù)為①求的數(shù)學(xué)期望和方差;②求與的協(xié)方差和相關(guān)系數(shù),并討論與是否相關(guān)?山東建筑大學(xué)試卷共3頁第3頁·····································································
6、······································裝訂線··································································································七、(本題滿分10分)二維隨機(jī)變量(X,Y)的概率密度為求:(1)系數(shù)A;(2)X,Y的邊緣密度函數(shù);(3)問X,Y是否獨(dú)立。八、(本題滿分12分)設(shè)總體,其中是已知參數(shù),是未知參數(shù).是從該總體中抽取的一個樣本,⑴.求未知參數(shù)的極大似然估計(jì)量;⑵.判斷
7、是否為未知參數(shù)的無偏估計(jì).九、(本題滿分8分)設(shè)總體,其中且與都未知,,.現(xiàn)從總體中抽取容量的樣本觀測值,算出,,試在置信水平下,求的置信區(qū)間.(已知:,,,).2008~2009-1學(xué)期《概率論與數(shù)理統(tǒng)計(jì)》期末考試試題A參考答案及評分標(biāo)準(zhǔn)一、填空題(每題3分,共15分)1、2、0.43.4、2.65、二、選擇題(每題3分,共15分)1、C;2、D;3、B;4、B;5、C三、(本題滿分8分)解:設(shè)Bi=“取出的零件由第i臺加工”…………5分…………3分四、(本題滿分10分)解:由題意知,X的可能取值為:0,1,2,3;Y的可
8、能取值為:1,3.且,…………2分,…………2分,…………2分.…………2分于是,(1)(X,Y)的聯(lián)合分布為YX300102030(2).…………2分五、(本題滿分12分)解:隨機(jī)變量的密度函數(shù)為…………2分設(shè)隨機(jī)變量的分布函數(shù)為,則有…………2分①.如果,即,則有;②.如果,則有即……