Problem:
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 Choices:
A.
B.
C.
D.
E.
Solution:
Counting the number of each occurence, we can see that there are and . Therefore, there are:
The total number of days of exercise is:
The mean number of days of exercise is defined as being equal to the total number of days of exercise divided by the total number of students, where:
Thus, is the correct answer.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions