For each of the following statements, select Yes if the statement must be true of a boy selected at random from 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.

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.

For each of the following statements, select Yes if the statement must be true of a boy selected at random from a model population. Otherwise, select No.

Yes No

If his age is greater than 3 years 3 months， the probability that his height is at least 98.0 cm is greater than 50%.

If he is at least 105 cm tall，the probability that his weight is 14.0 kg is no greater than 3%.

If he is 114 cm tall， he is taller than at least 85% of boys his age.

正确答案： 1,1,2

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知识点概述
本题涉及到统计学中的百分位数（percentile）概念，以及基于数据表格进行信息判断的能力。百分位数表示在一组数据中，某个数值大于或等于该组数据中一定比例数值的位置。解析
题目要求根据表格数据判断关于从模型人口中随机选取的男孩的陈述是否必然为真。需要理解表格中不同年龄男孩在各个百分位对应的身高数值，并据此对陈述进行逻辑判断，看其是否符合表格所呈现的数据特征和百分位数含义。比如，若陈述涉及某个年龄男孩身高在特定百分位的范围情况，就需在表格中找到对应年龄和百分位的数据来判断陈述真假。

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