how could it be a probability on something but at the end it's zero? I mean like this question

the probability of accommodating people in specific area is zero, but to find how many people on that area could be zero! I mean however there's probability but that doesn't mean actually there would be "people" on that area, might be zero ... how is that logically?! it's not making sense .. since we have probability of accommodating on specific area .. then there would be people there why not?! any help