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

Question

Quizplus · Accepted Answer

While there may be some individuals in a developed country who are only children, it is more common for people to have at least one sibling. According to a study by the United Nations, the average number of siblings per person in developed countries is around 1.5. This means that approximately 80% of people in developed countries have at least one sibling. Therefore, choice B is the most reasonable answer.

Your Roommate Is an Only Child