Problem: In 2025, an investigator drew a 1% (simple) random sample of all adults in a community of 1050 persons. An initial examination revealed 50 existing cases of a chronic disease for which there was no recovery. Forty percent of the total sample had a particular exposure, which remains unchanged over time. Within the new five years, 55 cases of the disease occurred in the study population; 40 of these cases were exposed. Assume steady state conditions and that the exposure is not a prognostic factor for the disease. Estimate the mean duration of disease----i.e. the average time between diagnosis and death. Mean duration of disease = years (2 decimals) Need Assignment Help?