The values of five patients' systolic blood pressure readings are 110, 120, 120, 130 and 150 mmHg. What is the median value?
Correct answer: B. 120 mmHg
- A. 110 mmHg
- B. 120 mmHg
- C. 130 mmHg
- D. 150 mmHg
Explanation
The median is the middle value when observations are arranged in order. The third value in this ordered set is 120 mmHg. The mean would be calculated by adding all five values and dividing by five.
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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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