Very low, unless you have something really unique to offer.
Most Helpful Girl
It's not as difficult as ratios you mentioned But it's not easy either. In case of women, first impression occurs through personality+looks. Women would easily go for a guy with nice personality+average/below average looks. It's common. In case of men, first impression is about looks only. Nothing wrong with that. That's how men and women are wired. Add up the fact that people, in general, tend to get attracted more to someone of same attractiveness level. That's how men are wired. So it makes matters slightly more difficult Hence a hot guy with girl having average looks is less common