选择题
2018 AMC 8 Problem 8: Exercise Bar Graph Mean
Mr. Garcia asked the members of his health class how many days last week they exercised for at least 30 minutes. The results are summarized in the bar graph. What was the mean number of days of exercise last week, rounded to the nearest hundredth?
2018 AMC 8 第8题：练习条形图平均值
加西亚先生询问健康班的成员上周有多少天锻炼了至少 30 分钟。结果总结在条形图中。上周平均锻炼天数是多少（四舍五入到最接近的百分之一）
A.
3.50
B.
3.57
C.
4.36
D.
4.50
E.
5.00