The Centers for Disease Control and Prevention reports that the rate of Chlamydia infections among American women age 20 to 24 is 2791.5 per 100,000. What are the approximate odds of a Chlamydia infection in the 20- to 24-year-old U.S. female population?

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The odds of a Chlamydia infection can be calculated by dividing the rate of infections per 100,000 by 100,000 and then dividing the result by the probability of not getting infected (1 minus the probability of getting infected). The rate is 2791.5 per 100,000, which means the probability of getting infected is 2791.5 / 100,000 = 0.027915. The odds are then 0.027915 / (1 - 0.027915) = 0.027915 / 0.972085 ≈ 0.0287.

The Centers for Disease Control and Prevention Reports That the Rate