概率论期末试卷A及答案.doc

leading cadres awareness of right in place, study the party Constitution and party rules, series of speeches can make proper effect. Party cadres to two lead by example, to lead by example we must change our mind, recognizing that two is important. First, learn the Communist Party Constitution Party rules, learning learning series important speech by General Secretary can enhance theory. With the third revolution the rise of rapid changes in our life are feeling, the Communists should adhere to the theory of confidence will continue to learn from the voices of the times, the times, in turn, will have new requirements for leading party cadres. Two is the most basic meaning of members all mastering the core theory and the most advanced weapons theory, complement the spirit of calcium. Secondly, the Communist Party Constitution Party rules, learning learning series important speech by General Secretary be able to firmly build the ideological foundation. Under the impact of multiple values, the two is to help cultivate independent judgment in numerous miscellaneous multiple concepts, so that the majority consensus of party members, the important magic weapon of the party with the resonance frequency. Finally, the Constitution of the Communist Party, party rules, learning learning series important speech can stand crowds, General Secretary position. Now, some grass-roots work in the the old way didnt work, hard way cannot, the new approach would not phenomenon, sometimes due to a mass of party members and cadres not understanding, does not meet. In fact, the mass convincing and identityBehind are likely to be party members and leading cadres themselves ignoring beliefs held, resulting in lack of persuasion and sense of identity. Two is in fact guaranteed party cadres work, an important prerequisite for convincing the masses. Bacon said it well: practical men can handle individual matters, but looking at the whole operation globally, but only man can do to knowledge. Giving up two effective, must first raise awareness of leading cadres of party members, as party members learn real responsibility to know to music , good changes, in parallel with the ground, do not forget to also answer the antenna, draw catches on meteorology, which sit between heaven and Earth which melds together the dreams of practicing Communist. Members cadres should in two learn a do in the based post do contribution in all members in the carried out learn Constitution Party rules, and learn series speech, do qualified members learning education, this is following party of mass line education practice activities and three strict three real topic education zhihou, deepening party education of and once important practice, is promoted three strict three real topic education from key minority to all members expand, and from concentrated education to regular education extends of important initiatives. Vast numbers of party members and cadres in the course of two, should be扬州大学试题纸( 20092010学年第 一 学期 )物 理 学院 微电、电科、光科09级 课程 概率论与数理统计（A）卷题目一二三总分得分一、填空题（共22分,2分/空） 1 设随机事件,互不相容，且，则.2已知连续型随机变量的分布函数为，则常数 ,概率密度函数 .3. 设随机变量在上服从均匀分布,则 ， .4.设随机变量X的概率密度函数为 则 ， .5设随机变量相互独立，且,，记，则 , .6设，则利用切比雪夫不等式估计 .7设总体，是从中抽取的一个样本，则的联合概率密度函数 . 概率论与数理统计A卷 第1页 共6页学院系班级学号姓名-装-订-线-二、单项选择题 （共24分,3分/题）1. 设是3个随机事件,则表示 .A. 都发生 B. 都不发生C. 至少有一个发生 D. 不多于一个发生2 三人独立地猜一谜语,已知各人能猜出的概率分别为1/5, 1/3, 1/4. 则三人中至少有一人能猜出此谜语的概率是 .A. 3/5 B. 2/5 C. 1/60 D. 59/603. 设是相互独立的两个随机变量，它们的分布函数分别为则的分布函数为 .A. B. C. D. 4设随机变量，令，则 . .5设总体XN()，X1，X2，X10为来自该总体的样本，为样本均值，则 . A. B C. D6. 设总体XN(0, 1)，X1，X2，Xn为来自该总体的样本，则统计量 . 概率论与数理统计A卷 第2页 共6页7. 设总体与相互独立，且都服从正态分布是从总体中抽取的一个样本，是从总体中抽取的一个样本，则统计量 . 8. 设总体，是从该总体中抽取的一个简单随机样本，则下列表达式可以作为的无偏估计量的是_ 三计算题（共54分，9分/题）1将两信息分别编码为和发送出去，接收站收到时，被误收作的概率为；而被误收作的概率为，信息与信息传送频繁程度为若已知接收到的信息是，求原发信息也是的概率 -装-订-线-概率论与数理统计A卷 第3页 共6页概率论与数理统计A卷 第4页 共6页第5页 共6页2. 盒子中有5个球，编号分别为从中随机取出3个球，引入随机变量，表示取出的3个球中的最大号码(1) 求随机变量的分布律;(2) 求随机变量的分布函数3设随机变量，试求随机变量的概率密度函数 4设的联合概率密度函数为，（1）求;（2）求的边缘概率密度函数； （3）判断随机变量与是否相互独立. 5某运输公司有500辆汽车参加保险，在一年内每辆汽车出事故的概率为0.006，每辆参加保险的汽车每年交保险费800元，若一辆车出事故保险公司最多赔偿50000元试利用中心极限定理计算，保险公司一年赚钱不小于元的概率附：标准正态分布分布函数表：0.560.570.580.590.71230.71570.71900.7224 概率论与数理统计A卷 第5页 共6页第6页 共6页-装-订-线-6设总体的概率密度函数为 ，其中是未知参数，是从该总体中抽取的一个样本（1） 求未知参数的矩估计量；（2） 求 概率论与数理统计A卷 第6页 共6页09级概率论与数理统计(A)卷参考答案及评分标准一、填空题（共22分，2分/空）.1 2. , 3. 2, 4/3 4. 5. 6. 7. 二、单项选择题（共24分，3分/题）.1C 2.A 3.C 4.D 5.C 6.A 7.C 8.B 三、计算题（共54分,9分/题）.1. 解： 设， ，则由题设， (3分)(1) 根据全概率公式， (3分)根据Bayes公式，得 (3分) 2.解： 的可能取值为且，所以，随机变量的分布律为：345( 6分) 随机变量的分布函数为： ( 3分)3解： 随机变量的概率密度函数为 （2分）设随机变量的分布函数为，则有 （2分） . 如果，即，则有；（1分）. 如果，则有 即 （2分） 即 （2分）4. 解：（1） =（3分） 当时， 所以，随机变量的边缘密度函数为 ；（2分） 当时， 所以，随机变量的边缘密度函数为（2分） ，与不独立（2分）5. 解: 设，则（1分） 设：运输公司一年内出事故的车数则 (3分) 保险公司一年内共收保费，若按每辆汽车保险公司赔偿50000元计算，则保险公司一年赚钱不小于元，则在这一年中出事故的车辆数不能超过4辆因此所求概率为 （5分）6. 解： . ，（3分）所以， ，将用样本均值来替换，得未知参数的矩估计为 （2分）. ，(1分)而 (2分)所以， . (1分)第8页-装-订-线-第9页第10页非谓语动词是历年高考英语的重要考点之一，也是较难掌握的难点之一。它贯穿于英语学习和考试过程的始终。但是，只要认真分析、透彻理解、看透本质、准确把握，就一定能在高考中运筹帷幄，游刃有余。based on their actual, striving to be learning and done markers. Strengthening theoretical study, belief and faith. Theory is an action guide, only theoretical knowledge in place, to unity, action can consciously. Constitution is the fundamental law of the party, party rules are party must follow the General rules. Studying and implementing the party Constitution Party rules and a series of important speech, General Secretary, is a guide to persisting and developing socialism with Chinese characteristics, is a basic work of strengthening the partys construction, but also each and every Communist Party Members obligations and solemn responsibility. These important content, for each party, must know would believe will do both. WeGeneral Secretary of the party Constitution, a series of remarks with, and hold, grasp the real learning that basis, based on the Constitution speak to issue, in accordance with the series changed the problem. Second, disciplined in line, to become law-abiding model. Is not no rules. If there is no iron discipline, party members and cadres will become a mess, it will lose its fighting strength and vitality, purity and naturally much less advanced. By two education, party members and cadres to keep the bottom line, not the more red lines, consciously practice the three Suns and consciously act according to the Constitution, party rules, remains a political force, to perform party oath, a tree of its own image. Three is the loyal, dare to play and play to party members. Learning is the Foundation, is the key to development is the goal. Two main objective is to let the majority of the play to the exemplary role of party members and cadres, party Constitution, party rules to examine. To use new criteria to guide our behavior. Through education, the ideal and conviction, keep in mind that membership, learn, learn, learn go play a vanguard and exemplary role, the courage to play as, and always maintain the pioneer, pioneering and enterprising spirit, and constantly improve our own capacity and level of service, according to positions and make contributions. Hearts change, lead more strict began in the kn