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【OG20-P282-339题】
Last school year, each of the 200 students at a certain high school attended the school for the entire year.If there were 8 cultural performances at the school during the last school year, what was the average (arithmetic mean) number of students attending each cultural performance?
（1）Last school year, each student attended at least one cultural performance.
（2）Last school year, the average number of cultural performances attended per student was 4.
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条件1:200个学生都会参加表演，但是多少个学生是参加了一个以上的未知，不充分
条件2：平均每个学生参加了4个表演，一共200*4=800人次。平均每个表演参加人数＝200*4/8，充分
题目讨论 （6条评论）
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1048993hyug
主要没读懂
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2022-10-15 18:08:00
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willowX
知道表演类型数c，知道学生数s，只要再知道总节目数u，就能知道平均每个表演类型的节目数u/c。而要知道u可以用u/s反推
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2022-07-11 11:29:17
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你这只猪
what's the average of students attending each cultural performance and and average of number performance attended per students 想了很久才想出区别
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2020-04-12 14:18:28
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梦sir
Target question: What was the average (arithmetic mean) number of students attending each cultural performance? Given: 200 students. 8 cultural performances Statement 1: Last school year, each student attending at least one cultural performance There are several scenarios that satisfy statement 1. Here are two: Case a: every student attended exactly 1 performance last year. So, the TOTAL attendance was 200 last year, which means the average number of attendees for each performance = 200/8 = 25 Case b: every student attended exactly 2 performances last year. So, the TOTAL attendance was 400 last year, which means the average number of attendees for each performance = 400/8 = 50 Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT Statement 2: Last school year, the average number of cultural performance attended per student was 4. So, the TOTAL attendance was last year = (200)(4) = 800 This means the average number of attendees for each performance = 800/8 = 100 Since we can answer the target question with certainty, statement 2 is SUFFICIENT
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2020-03-13 15:57:47
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Adam贾
第二个条件说是每个人平均下来有四个节目，所以200个人就表演了800个节目，一共有8种文化节目，所以平均下来，一个节目一百人
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2018-10-27 18:22:48
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岛岛岛姐
200个人*4次=800次 800/8=100人/每个节目
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2018-02-24 06:14:04
