2018 AMC 8 Problem 8
Attempt Problem 8 of the 2018 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2018 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
8.
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?
Answer: C
Small hint:
Compute the weighted average from the bar heights.
Big hint:
First find the total number of students, then find the total number of reported exercise days.
Video solution:
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Written solution:
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.
Problem 8 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
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