How is world population calculated? And how accurate is the number? Is it possible that the number can be entirely wrong?

Question

How is world population calculated? And how accurate is the number? Is it possible that the number can be entirely wrong?

In: Other

Answer 1

My understanding is there’s a roll-call every four years where everyone says their name and a guy with a clipboard writes it down. If a child is born, the parents call out “girl” or “boy” and if someone dies a relative calls out “dead one!”