2. 外语
  3. Questions are based on the following data. In 2005, if the ratio of the number of full-time employees from age 30 to 34 to the

Questions are based on the following data. In 2005, if the ratio of the number of full-time employees from age 30 to 34 to the

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问题 Questions are based on the following data.

In 2005, if the ratio of the number of full-time employees from age 30 to 34 to the number of full-time employees from age 35 to 41 was 5 to 3, which of the following could be the average (arithmetic mean) age of the full-time employees in the 30-41 age-group?
选项 A、31
B、35
C、37
D、39
E、41
答案B
解析 这里无需关注图表中具体数据，只需看两个年龄段的比例。假设30岁到34岁的员工平均年龄为x，35岁到41岁的平均年龄为y，显然30≤x≤34，35≤y≤41，30岁到41岁的员工平均年龄为(5x+3y)/8，考虑极端情况，x=30，y=35时平均年龄为31.875，x=34，y=41时平均年龄为36.625，故符合条件的选项为B。
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