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.
Height-for-age
The table displays the percentil 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


Weight-for-height

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 heigh 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.

A If his age is exactly 4 years 0 months, the probability that his height is at exactly 99.0 cm is 15%
B. If he is 81 cm tall, he is shorter than at least 95% of boys his age.
C. If he is 120 cm tall, he weighs more than 97% of boys age 2 years 6 months.


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