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수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [HME] 도수분포표의 평균
은총알 2020.01.22 09:36 조회 917
문제 푼 사람 0명
공유하기
페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

HME 수학학력평가 2014년도 하반기 24번 문제입니다.

 

아래 표는 연정이네 반 학생들의 미술 실기 점수를 조사하여 나타낸 도수분포표이다. 이 도수분포표에서의 평균은 계급의 크기를 각각 20점, 30점으로 하여 만든 2개의 도수분포표에서의 평균과 같다고 한다. b, c가 한 자리의 소수일 때, abc의 값을 구하여라. (단, 미술 실기 점수는 60점이 만점이다.)

점수(점) 도수(명)
0이상~10미만 5
10~20 a
20~30 9
30~40 b
40~50 4
50~60 c
합계  

 

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