MCAT Behavioral Sciences Question 170: Answer and Explanation
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Question: 170
5. A small town has 1000 residents, including 500 men and 500 women. In this town, 20 of the men have prostate cancer. During a calendar year, 10 more men are diagnosed with prostate cancer. Assuming none of the men are cured or die during the year, what is the prevalence of prostate cancer in this population at the end of the year?
- A. 10 ÷ 480
- B. 10 ÷ 1,000
- C. 20 ÷ 500
- D. 30 ÷ 1000
Correct Answer: D
Explanation:
Prevalence is defined as the total number of cases divided by the total population during a period of time. Here, the period of time is defined as one point: the end of the year. At the end of the year, there are 30 total cases in a population of 1000 individuals, meaning the prevalence is 30 ÷ 1000.