Noticed this da last few days... wot's dat?
Most Helpful Girl
That is something new that was introduced last week. If a user has less than 10 opinions on questions that do not have a MHO selected, their MHO percentage will have a question mark. So, users have to have at least 10 opinions on questions with a MHO selected now for it to show their percentage. It's so if a user posts a single opinion and got awarded MHO, they won't have a 100% MHO rating.3