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 期末我手上沒考卷
不過大概記得就是在考一些分布的pmf pdf還有期望值跟變異數(寫出來就好了不用算)
還有一題是問機率論在幹什麼= =""
老師還另外出了一張考卷都是計算題..不過都是課本上的題目啦
其實在課堂上考老師不會出太繁雜的計算
都是兩三步就有答案的題目
基本定義要知道比較重要...都是她上課強調的東西..所以我覺得筆記蠻重要的@@"
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