A city contains 100,000 people (45,000 male and 55,000 females), and 1,000 people die per year (600 males and 400 females). There were 50 cases (40 males and 10 […]
A city contains 100,000 people (45,000 male and 55,000 females), and 1,000 people die per year (600 males and 400 females). There were 50 cases (40 males and 10 […]