Calculate the appropriate disease frequency rate. Show your work. The cumulative incidence rate in a population of 100,000 people where 9 new cases of disease were reported within 1 year. The prevalence of a chronic disease on November 1st where 9 initial cases were found in September with an additional 45 cases reported in October of a small city with a population of 75,000 people. The relative risk of death from exposure A if the mortality rate in the exposed group is 60 deaths per 1000 person-years and the mortality rate in the unexposed group is 20 per 1000 person-years.