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性质设ζi(i=1,2,…,n)为n个随机变量,则E(ζ1+ζ2+…+ζn)=E(ζ1)+E(ζ2)+…+E(ζn).下面就先以2003年新课程高考卷(理工科)的第20题为例来说明.原题A、B两个代表队进行乒乓球对抗赛,每队三名队员,A队队员是A1、A2、A3,B队队员是B1、B2、B3,按以往多次比赛的统计,对阵队员之间
Then we have E (ζ1 + ζ2 + ... + ζn) = E (ζ1) + E (ζ2) + ... + E (ζn) with the property that ζi (i = 1,2, ..., n) is n random variables. The 2003 New Curriculum Entrance Examination (Science and Engineering) Question 20 as an example to illustrate the original title A, B two table tennis tournament competition, each team of three players, A team of players A1, A2, A3 , B team members are B1, B2, B3, according to the statistics of multiple matches in the past, between the players