The ages of four patients are 20, 30, 40 and 50 years. What is the arithmetic mean age?
Correct answer: B. 35 years
- A. 30 years
- B. 35 years
- C. 40 years
- D. 45 years
Explanation
Add the ages and divide by the number of observations: 20 + 30 + 40 + 50 = 140, and 140 divided by 4 equals 35 years. The median would also be 35 in this example, but the question asks for the mean.
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About Epidemiology and Biostatistics
Epidemiology examines the distribution and causes of disease by person, place and time, using measures such as incidence, prevalence, mortality and case-fatality rates. Biostatistics covers data presentation, sampling, averages, variability, probability and interpretation of study results, while distinguishing association from causation.
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