A hypothetical vaccine has a 2% "failure rate".It has been administered to all but 12 children in a school with 1000 students.The disease the vaccine is designed to prevent is introduced by a new student and spreads rapidly via the respiratory route.How many children do you predict will fall ill by catching the diease from the sick child?

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Quizplus · Accepted Answer

Given a 2% failure rate, 2% of the vaccinated children (988 vaccinated students) are expected to still be susceptible to the disease. 2% of 988 is approximately 20. Adding the 12 unvaccinated children, the total number of children predicted to fall ill is 32.

A Hypothetical Vaccine Has a 2% "Failure Rate