2018 AMC 8 第 8 题
先试着解答 2018 AMC 8 第 8 题，然后核对你的答案与视频与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2018 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
8.
Garcia 老师询问健康课的学生上周有多少天至少锻炼了 分钟。结果汇总在下面的条形图中，柱子的高度表示学生人数。
Garcia 老师班上学生报告的上周锻炼天数的平均数是多少？答案四舍五入到最接近的百分之一。
Mr. Garcia asked the members of his health class how many days last week they exercised for at least minutes. The results are summarized in the following bar graph, where the heights of the bars represent the number of students.
What was the mean number of days of exercise last week, rounded to the nearest hundredth, reported by the students in Mr. Garcia’s class?
小提示：
根据条形图高度计算加权平均数
Compute the weighted average from the bar heights.
大提示：
先求学生总数，再求报告的锻炼天数总和
First find the total number of students, then find the total number of reported exercise days.
视频讲解：
Click to load, then click again to play
文字解答：
从条形图可知，锻炼 天的学生人数依次为 ，学生总数为 。
学生报告的锻炼天数总和为
平均数为 天。
所以正确答案是 C。
The bar heights for days are , for a total of students.
The total number of reported exercise days is
The mean is days.
Thus, C is the correct answer.
其他年份的第 8 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
- 1995 AMC 8
- 1996 AMC 8
- 1997 AMC 8
- 1998 AMC 8
- 1999 AMC 8
- 2000 AMC 8
- 2001 AMC 8
- 2002 AMC 8
- 2003 AMC 8
- 2004 AMC 8
- 2005 AMC 8
- 2006 AMC 8
- 2007 AMC 8
- 2008 AMC 8
- 2009 AMC 8
- 2010 AMC 8
- 2011 AMC 8
- 2012 AMC 8
- 2013 AMC 8
- 2014 AMC 8
- 2015 AMC 8
- 2016 AMC 8
- 2017 AMC 8
- 2019 AMC 8
- 2020 AMC 8
- 2022 AMC 8
- 2023 AMC 8
- 2024 AMC 8
- 2025 AMC 8
- 2026 AMC 8