B is a boy aged 4 years 3 months whose height is 110 cm and whose weight is 19 kg. For each of the following statements, select Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select No._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. 微信截图_20231107184228.png

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

B is a boy aged 4 years 3 months whose height is 110 cm and whose weight is 19 kg. For each of the following statements, select Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select No.

Yes No

Approximately 50% of boys at the same weight are shorter than B.

No more than 15% of boys at this age are taller than B.

B's height is greater than or equal to that of 50% of boys aged 5 years 0 months.

正确答案： 2,1,1

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知识点概述
本题主要涉及数据解读中的百分位数（Percentile）概念，需要根据给定的儿童身高百分位数分布表来判断相关陈述是否正确。解析
1. 表中给出了不同年龄男孩身高的第3、15、50、85、97百分位数对应的身高数值。 2. 男孩B是4岁3个月，身高110cm。从表中可知4岁3个月时，第85百分位数身高是109.5cm，第97百分位数身高是113.1cm ，110cm介于85 - 97百分位数之间，可据此判断关于B的相关陈述。

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