Question 21. Please show the work

19. How many physicians on low-dose aspirin did not Have a lily For questions 20-22, use the following information. Suppose the annual expected mortality rate from lung cancer is 45 per 100,000 individuals. 20. In a specific community of 300,000 individuals, how many deaths are expected to be attributed to lung cancer over a one-year period? 21. The actual (observed) number of deaths attributed to lung cancer in the community was 180 individuals over a one-year period. What would be the observed/expected ratio for these deaths? Please reduce to the simplest form