Igcse Model Questions Vol1 2019 Mathematics Question 20
Practice objective / multiple choice question 20 from the 2019 Igcse Model Questions Vol1 Mathematics examination.
In a certain population, 2 % of people have a particular disease. A first screening test has a sensitivity of 90 % and a specificity of 85 %. Individuals who test positive are given a second, more accurate test with a sensitivity of 95 % and a specificity of 98 %. What is the probability that a person who tests positive on both tests actually has the disease? Express your answer as a fraction in lowest terms.
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This is Igcse Model Questions Vol1 2019 Mathematics Question 20. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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