期中考 1.Define the following: (1)statistical experiment (2)sample space (3)event (4)probability measure (5)random variable (6)conditional probability (7)independence of three events (8)expectation of a random variable (include both continuous type and discrete type of random variables) (9)variance of a random variable (include both continuous type and discrete type of random variables) (10)cumulative distribution function 2.If total of 28% of American males smoke cigarettes, 7% smoke cigars, and 5% smoke both cigars and cigarettes (a)what percentage of males smoke neither cigars nor cigarettes? (b)what percentage smoke cigars but not cigarettes? 3.Suppose that 5% of men and 0.25% of women are color blind. A colorblind person is chosen at random. What is the probability of this person being male? Assume that there are an equal number of males and females. What if the population consisted of twice as many males as females? 4.Suppose that X takes on one the values 0,1,2. If for some constant c, P{X=i}= cP{X=i-1}, i=1,2, find EX 5.In a class there are 4 freshman boys, 6 freshman girls, and 6 sophomere boys. how many sophomore girls must be present if sex and class are to be independent when a student is selected at random? 上面是期中考的 期末我手上没考卷 不过大概记得就是在考一些分布的pmf pdf还有期望值跟变异数(写出来就好了不用算) 还有一题是问机率论在干什麽= ="" 老师还另外出了一张考卷都是计算题..不过都是课本上的题目啦 其实在课堂上考老师不会出太繁杂的计算 都是两三步就有答案的题目 基本定义要知道比较重要...都是她上课强调的东西..所以我觉得笔记蛮重要的@@" --

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