Questions are based on the following data.[img]2022m10s/ct_ve01203002j_egreqtbz

游客2025-02-23 37

问题 Questions are based on the following data.

[br] Based on the information given, which of the following statements must be true? Indicate all such statements.

选项 A、The median age of the full-time employees in the 30-41 age-group in 2017 was 35.5 years.
B、For each of the three age-groups, the ratio of the number of full-time employees to the number of part-time employees increased from 2005 to 2017.
C、In 2017, the number of part-time employees over age 50 was greater than the number of full-time employees over age 50.

答案 B

解析选项A: 由于没有具体数据，无法计算中位数，错误。选项B：2005年全职和兼职的比例为(150+192+153)/(202+248+190)=495/640=0.77，2017年比例为(190+235+182)/(215+258+208)=607/681=0.89，增加了，正确。选项C：从大于42岁的数据中无法判断大于50岁的数据，错误。

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