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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
A와 B가 100점만점인 시험을 10번 봐서 그 평균점수로 누가 수학을 더 잘하는지 결정하기로 했다.
A는 꾸준히 85점을 맞았다. 그래서 평균점수도 85점이 되었다.
B는 처음에는 70점이었지만 점차 성적이 올라가 마지막 시험때는 평균 점수가 90점이 되었다.
A는 결과를 인정할 수 없어 B에게 시험성적이 나올때마다 기록한 B의 평균점수 표를 달라고 했다.
B의 평균점수 변화는 다음과 같다.
70 -> 74.5 -> 72 -> 76 -> 79.75
-> 80.5 -> 83.25 -> 86 -> 85.75 -> 90
A는 이 평균점수표를 통해 B가 점수를 조작했다는 사실을 알아냈다.
어떻게 알아냈을까?
단, 시험점수는 꼭 정수가 아니어도 된다. 다시말해, 시험점수는 양의 유리수이다.
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△π
Lv.9
2020.04.10 07:51
비밀댓글
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GUN.007
Lv.11
2020.04.11 02:06
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확인요청중
비밀 댓글이 등록 되었습니다.
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