I need help solving 3.2.31. If someone can give me a explanation on this question that would be great

on 3.2.31 In order to determine who would accept a Facebook friend or request from someone they didn't know, a student researcher made up a phony Facebook profile that represented a male student at her college. She then sent out 101 friend requests and 18 of these accepted of the request. Find a 95% confidence interval for the proportion of all students that would accept a Facebook request from a male at their college that they did not know