2022初三英语周报第四期答案

18.(1)设“可判断两个选项是错误的”两道题之一选对的为事件A,“有一道题可判断一个选项是错误”选对的为事件B,有一道题不理解题意”选对的为事件C,,P(A)=,P(B)=3P(C=,得40分的概率为P=×××+一(4分)(2)得25分或30分的可能性最大得20分的概率为:F××x=;得25分的概率为P×××3×+×+÷得30分的概率为:Px×3×是+××号xx是+x×3×2+1××3×-据得35分的概率为:P×××号×+号××号×+7×3×4=48(8分)(3)E()=20×6+(25+30)×+35×方+40×=57548-12≈27.92.(12分)

第二节书面表达Dear Mike,Deeply sorry for not being able to go to the bookstorewIth youthis Sunday, I'm writing in an effort to make ahange to our plan.Just now I was informed to attend an importantvoluntary activity that is to be held on the very day. So Ireally feel pity that I can't accompany you to thebookstore. Would it be possible for us to go there anothertime, let's say, next Sunday morning? If so, we'll haveenough time to make a choice about which books to bebought.Please let me know your decision as soon as possible.Yours,Li Hua

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