Consider an individual boy from a model population. Suppose that from age 2 through age 5, this boy's weight is at the 97th percentile for his height and his height is at the 97th percentile for his age. Which one of the following statements must be true of the boy at age 5 years 0 months?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Height-for-age standards
Weight-for-height standards

The World Health Organization (WHO) has produced a comprehensive set of growth standards for children. These standards are based on studies of children living in 6 nations on 5 continents under optimal conditions with respect to health and nutrition. The table displays the percentile distribution of height, in centimeters, at 3-month intervals, for boys ages 2 through 5 according to the WHO model. In a model population -- a large population of boys ages 2 through 5 that conforms to the WHO growth standards -- for n = 3, 15, 50, 85, and 97, nth percentile in height for a given age is the unique height among boys of that age that is greater than or equal to n percent, and less than or equal to (100- n) percent, of heights of boys of that age.

The graph shows the percentile distribution of weight, in kilograms, for heights from 80 cm to 120 cm, for boys ages 2 through 5, according to the WHO model. In a model population, for n = 3, 15, 50, 85, and 97, the nth percentile in weight for a given height is the unique weight among boys of that height that is greater than or equal to n percent, and less than or equal to (100 - n) percent, of weights of boys of that height. 微信截图_20231107184228.png

Consider an individual boy from a model population. Suppose that from age 2 through age 5, this boy's weight is at the 97th percentile for his height and his height is at the 97th percentile for his age. Which one of the following statements must be true of the boy at age 5 years 0 months?

A.His age is at the 97th percentile for his height.
B.His weight is at the 97th percentile for his age.
C.His height is at the 97th percentile for his weight.
D.His weight is approximately 166% of his weight at age 2 years 0 months.
E.His weight is approximately 197% of his weight at age 2 years 0 months.

正确答案： D

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涉及知识点概述
本题主要涉及百分位数（Percentile）的概念，即在一个数据集中，某个特定百分位数代表的值是大于或等于该百分比的数据，且小于或等于剩余百分比的数据。解析
已知该男孩2 - 5岁体重在身高对应的第97百分位，身高在年龄对应的第97百分位。对于5岁0个月时： - 选项A：年龄是固定值，不存在年龄在身高的百分位数这种说法，A错误。 - 选项B：因为一直有体重在身高对应的第97百分位这一条件，所以5岁0个月时他的体重在身高对应的第97百分位，B正确。综上，答案是B。

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