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Questions are based on the following data.[img]2022m10s/ct_ve01203002j_egreqtbz
Questions are based on the following data.[img]2022m10s/ct_ve01203002j_egreqtbz
游客
2025-02-23
31
管理
问题
Questions are based on the following data.
[br] 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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