Answer:
less than or equal to, less than or equal to, as tall as or taller than, much or more than
Step-by-step explanation:
Filling in the blanks in the given passage gives us the following:
"This means that 45% of boys his age weigh less than or equal to his weight and 76% of boys his age are less than or equal to his height. Because he is as tall as or taller than 76% of boys, but only weighs as much or more than 48% of boys, he is probably fairly thin."
In a percentile, the actual value will fall at or below that value. For the first sentence, we fill both in with less than or equal to. For the second sentence, we know that if he is less than or equal to the height of 76% of boys his age, then he will be taller than 76% of the boys his age. We can apply this logic to his weight percentile as well.