About 2% of men are HIV positive. So just blindly using 1/4 you get 1/200 people are HIV positive. Assuming that the place discussed is a little bit above avera

About 2% of men are HIV positive. So just blindly using 1/4 you get 1/200 people are HIV positive. Assuming that the place discussed is a little bit above average, and you get a number that is consistent with the population having a 1 in 300 HIV rate.