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수학동아 - 폴리매스
함께 풀고 싶은 문제
나도 수학쌤 문장제 문제를 변형해 문제를 내는 곳입니다.
17수락
2020.11.03 18:41
조회 379
수락은 현재 줌 수업을 듣고 있다(실화.지금 발표하면서 쓰고 있는 수락)
줌 수업 인원은 총 32명이고(실화),
그 중 2명이 결석했다(그 2명은 남자)
줌 수업은 총 50분동안 하고 수락은 친구들 중 1명을 뽑아서 점수얻기를 하고 있다
10분에 1번씩 뽑기를 하고 있고 뽑기의 규칙은 이러하다
<규칙>
1.뽑기는 10분에 1번씩 진행하며 32명의 이름표가 박스 안에 있고 그 박스 안에서 1명의 이름을 뽑는 형식으로 한다
2. 32명 중 15명은 여자,17명은 남자이다
3. 결석한 사람의 이름표를 뽑으면 0점이다
4. 남자의 이름표를 뽑으면 5점, 여자는 4점이다
5. 이 반의 25%는 김씨이고 김씨의 이름을 뽑으면 5점을 추가로 얻는다
6. 이 반의 25%는 이 씨 이고 이 씨의 이를을 뽑으면 7점을 추가로 얻는다
7. 이 반의 30%는 최,정,강씨이며 그 성씨를 가진 사람들의 이름을 뽑으면 3점이 감점된다
8. 나머지 성을 가진 이름을 뽑으면 1점을 추가로 얻는다
총 5번 뽑기를 할때 점수를 13점 이상 얻지 못할 확률의 23%의 45%는 얼마인가?
* 제발 풀어주세요 지금 국어시간이고 줌 수업에서 현재 에르되시 팔에 대해 발표하고 있습니다. 지금 막 선생님이 뭘 쓰고있는지 의심하기 시작하네요(양심걸고 실화)
-
피카파이
Lv.8
2021.08.30 01:39
지금 바로
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