Your roommate is an only child. What percentage of people in developed countries have at least one sibling?

Question

Quizplus · Accepted Answer

While there is no exact percentage for this, studies have shown that around 90% of people in developed countries have at least one sibling. It is not 100% because there are cases of only children or people who have lost their siblings. It is not 60% or 40% because having siblings is a norm in most developed countries. Therefore, option B is the most accurate answer.

Your Roommate Is an Only Child