一次考试共有12道选择题,每道选择题都有4个选项,其中有且只有一个是正确的.评分标准规定:"每题只选一个选

首先得60分,还需要答对4到题p1=1/2x1/2x1/3x1/4=1/48设最后四道题答对的题数x,取值0,1,2,3,4P(X=0)=1/2X1/2X2/3X3/4=6/48,P(X=1)=1/2X1/2X2/3X3/4+1/2X1/2X2/3X3/4+1/2X1/2X1/3X3/4+1/2X1/2X2/3X1/4=17/48同理可计算P(X=2)=1/2X1/2X2/3X3/4+1/2X1/2X1/3X3/4X2+1/2X1/2X2/3X1/4X2+1/2X1/2X1/3X1/4=17/48P(X=3)=1/2X1/2X1/3X1/4+1/2X1/2X1/3X1/4+1/2X1/2X2/3X1/4+1/2X1/2X1/3X3/4=7/48P(X=4)=1/48数学期望EX=0x6/48+1x17/48+2x17/48+3x7/48+4x1/48=76/48=19/12若有不懂,欢迎交流(⊙o⊙)哦,望采纳(⊙o⊙)哦