Probability - bionomial distribution homework?

Update: In a certain population, 15% of the people have Rh-negative blood. A blood bank serving this population receives 100 blood donors on a particular day. a) Let X be the number of donors in the sample with Rh-negative blood. What is the exact distribution of X? So I get that this is a binomial distribution. But I... show more In a certain population, 15% of the people have Rh-negative blood. A blood bank serving this population receives 100 blood donors on a particular day.

a) Let X be the number of donors in the sample with Rh-negative blood. What is the exact distribution of X?

So I get that this is a binomial distribution. But I don't understand what the question means when it asks what is the exact distribution of X? How would I find the answer to a)?
3 answers 3