Question

A researcher spoke to 20 people running a marathon in which 1,400 people participated. Of those 20 people, 5 competed only in professional sporting events, 12 competed in only amateur sporting events, and the rest competed in both. What was the population size for this study?

A. 5
B. 12
C. 20
D. 1,400

Answer 1

I’m pretty sure the answer is A

Answer 2

Explanation:

The population size is everybody running the race. It does not include people watching the race and it is not confined to just the 20 people the researcher talked to.

If it doesn't limit itself to the 20 people, then the 5 and 12 and 3 people are also too limiting.