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 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.

refer fig 1

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.

refer fig 2

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


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


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


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made some changes

the first table is height vs age

and the second table gives the relationship b/w
height vs weight.

Hope this will be helpful
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the definition is as 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

so for Q.A : how can you be sure that the probability is greater than 50%
it can be 50% as well, right?
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can someone please explain the tabs? I cant understand the tabs.