2. 外语
  3. Questions are based on the following data. Based on the information given, which of the following statements must be true? Ind

Questions are based on the following data. Based on the information given, which of the following statements must be true? Ind

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问题 Questions are based on the following data.

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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