Today, two (2.5) children constitute Americans' ideal family size.
Two children is enough to replicate both parents which means that there will always be a steady number of young and old people in a country. Having two children is ideal - anything below that would result in a smaller population.
The answer is b) because the definition for aggregate is a whole formed by combining several elements
<span>Systematic Sampling
Maybe this helped answer your question, Have a nice day/night!
</span>