Question

英语高手啊,帮我看一下这道题吧!!万分感谢！

When Don plays tennis, 65% of his first serves go into the correct area of the court. If the first serve goes into the correct area, his chance of winning the point is 90%. If his first serve does not go into the correct area, Don is allowed a second serve, and of these, 80% go into the correct area. If the second serve goes into the correct area, his chance of winning the point is 60%. If neither serve goes into the correct area, Don loses the point.
(i) Draw a tree diagram to represent this information. [4] (04s)
(ii) Using your tree diagram, find the probability that Don loses the point.[3]
(iii) Find the conditional probability that Don’s first serve went into the correct area, given that he loses the point. [2]
我要的不是翻译，而是怎么做

Answer 1

不要打网球时,65%的他的第一个服务进入正确的地方法院。如果第一个服务进入正确的地方,他的机会赢得一点是90%。如果他先得不落在正确的地方,也允许第二服事人,并且其中,80%进入正确的地方。如果第二发球进入正确的地方,他的机会赢得一点是60%。如果没有为进入正确的地方,也失去了一点。
(我)画一个树图代表此信息。[4](4秒)
(2)使用你的树图,发现概率,却失去了一点[3]。
(3)发现的第一个条件概率不事奉,进了正确的地方,因为他失去了这一点。[2] 选我为最佳答案

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我要的不是翻译（题目意思我懂），而是怎么来做这道题目…而且你的翻译也不正确啊…

Answer 2

this is obviously a math problem more than an Engilsh one, and i suppose u should draw the tree diagram with specific requests, maybe u can find an example from ur text book and upload it, so that I will know the regulation.

追问

关键是我不会画这道题的树状图，书上题目我也看了，还是搞不清，这一章我比较薄弱…

追答

(2) 0.65*0.1+0.35*(0.8*0.4+0.2)=0.247

(3) (0.65*0.1)/0.247=26.3%

应该是这样的吧，因为我不确定你的课本里对树状图的要求是什么