Last year during my DS scholar visit, the parents were told that they average 30 offers of full scholarships and every year the average of students accepting the offers are 20. So, in short, the average of Citadel Scholars Scholarships is 20. For the interview, they also told the parents that the interview process is about 4 or 5 students will go into a room together, with one of the scholarships committee members to take notes on each student, who wrote on the same topic and the students have an open discussion about their papers. So, I don't think that there will be any questions during the interview process, at least that is what my DS told me. I did hear that in-state students have an "edge" in the selection process. Good luck and go into the "interview" process with an open mind and don't be the one student who doesn't contribute to the discussion.
My DS received the full scholarship.