Fourth hundred thousand death from all causes were reported in 1995 in Zaire. In this country, 150000 deaths occurred among young people, and 250000 deaths occurred among old people during the same year. In Ethiopia, 400000 death from all causes were reported in 1995, including 250000 among young people, and 150000 among old people.

c. How would an investigator determine which country had the crude incidence of mortality?

d. how would an investigator determine which country had the lower incidence of mortality among young people.?