[中译] Puzzleup 2019 (09) TEST SCORE

楼主: buffalobill (水牛比尔)   2019-09-19 10:37:04
题目网址: http://www.puzzleup.com/2019/
http://www.puzzleup.com/2019/puzzle/?09
答题时限: 09月19日7PM-比赛结束
加分时限: 09月19日7PM-09月25日6:59PM
答对可得基本分100分。答案可上传5次,每改1次答案从基本分扣20分。 
比赛期间内可随时上传答案,加分时限内答对第n天加(6-n)分       
另依题目的难易有额外加分(如有80%的人这题答错,答对者加80分)   
◆TEST SCORE
You will take a test with 10 questions and will get 1 point for each
correct answer. If the probabilities of getting 8 points and 7 points
are equal, what is the probability of correctly answering a question?
Note: The probability of each question being answered correctly is the
same.
Enter your answer as a simplified fraction. Example:12/23
你参加一个考试,有十道试题,每题答案会得1分。如果拿8分的机率跟拿7分的机
率一样,问答对一题的机率为何?
注:每道试题的答对机率是一样的。
以最简分数回答,如 12/23。
作者: DreamYeh (天使)   2019-09-25 20:06:00
到今天 大家加油

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