B is a boy aged 4 years 3 months whose height is 110 cm and whose weight is 19 kg. For each of the f...

题目信息

Height-for-age 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, the 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.

Weight-for-height standards

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 giver 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 age.

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

At least 15% of boys at the same height have a weight that is less than or equal to that of B.

At least 80% of boys at this age have heights within 10% of B's height.

B's height is less than that of at most 3% of boys at age 4 years 0 months.

参考答案及共享解析

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正确答案： Yes:At least 15% of boys at the same height have a weight that is less than or equal to that of B.; Yes:At least 80% of boys at this age have heights within 10% of B's height.; No:B's height is less than that of at most 3% of boys at age 4 years 0 months.;

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