If 20 of 100 at-risk individuals develop illness, what is the attack rate?

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Multiple Choice

If 20 of 100 at-risk individuals develop illness, what is the attack rate?

Explanation:
Attack rate is the proportion of people at risk who develop the illness during a defined period. It’s calculated as the number of new cases divided by the population at risk. In this scenario, 20 of 100 at-risk individuals become ill, so the attack rate is 20/100 = 0.20, which is 20%. This matches the idea of how many in the at-risk group ended up ill during that time frame. The other numbers would require a different count of cases or a different at-risk population (for example, 25 cases would be 0.25, 15 cases would be 0.15, etc.), so they don’t fit the given data.

Attack rate is the proportion of people at risk who develop the illness during a defined period. It’s calculated as the number of new cases divided by the population at risk.

In this scenario, 20 of 100 at-risk individuals become ill, so the attack rate is 20/100 = 0.20, which is 20%. This matches the idea of how many in the at-risk group ended up ill during that time frame.

The other numbers would require a different count of cases or a different at-risk population (for example, 25 cases would be 0.25, 15 cases would be 0.15, etc.), so they don’t fit the given data.

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