一台仪器每启动一次出现一个6位的二进制数a
1a
2a
3a
4a
5a
6恒为1,a
i和a
j(i≠j,i,j∈{2,3,4,5,6})之间出现1或0是相互独立的,且a
i出现1的概率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124235343236869/SYS201310251242353432368016_ST/0.png)
,出现0的概率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124235343236869/SYS201310251242353432368016_ST/1.png)
设X=a
1+a
2+a
3+a
4+a
5+a
6,当启动仪器一次时.
(I)求X=4的概率;
(II)求X的期望.
[注:E(ax+b)=aex+b].
考点分析:
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