电大应用概率统计试题A卷参考答案:小抄参考.doc
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1、专业好文档应用概率统计试题A卷参考答案:一、填空题(每空格3分,共30分)1;2. 3.4. 0.7755.61350.50.30.27.;8.9.10.二、判断题(每小题2分,共20分)1错2. 错3. 错4. 对5. 错6. 对7. 错8. 错9. 错10.错三、计算题(共35分)1解: -2分-2分-2分故的分布律为345-1分2. 解:因为随机变量服从正态分布,所以它的密度函数具有如下形式:; (3分)进而,将代入上述表达式可得所求的密度函数为:。 (2分)3.解:(1)设两次都是正品的事件为,-3分(2)设两次都是次品的事件为,-3分4. 解:因为随机变量,且与相互独立,所以利用正态
2、随机变量的可加性(或再生性)可知仍服从正态分布;-(3分)又因为 -(2分)由此可知所求的概率密度为。- (2分)5.解:以表示该样本均值,则-1分从而有 -5分故-1分由此得-1分即-1分所以至少应取35。-1分四、证明题(15分)证明:因为相互独立,所以; (2分); (2分); (2分)从而,我们可得由独立性的定义可知:与独立。 (9分)If we dont do that it will go on and go on. We have to stop it; we need the courage to do it.His comments came hours after Fifa
3、 vice-president Jeffrey Webb - also in London for the FAs celebrations - said he wanted to meet Ivory Coast international Toure to discuss his complaint.CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media.Blatter, 77, said: It has been decided
4、 by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them.It is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense.We can do
5、something better to fight racism and discrimination.This is one of the villains we have today in our game. But it is only with harsh sanctions that racism and discrimination can be washed out of football.The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifas anti-racism taskf
6、orce, is in London for the Football Associations 150th anniversary celebrations and will attend Citys Premier League match at Chelsea on Sunday.I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport.For me its about how he felt and I would like to speak to him
7、first to find out what his experience was.Uefa hasopened disciplinary proceedings against CSKAfor the racist behaviour of their fans duringCitys 2-1 win.Michel Platini, president of European footballs governing body, has also ordered an immediate investigation into the referees actions.CSKA said the
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