Igcse Model Questions Vol1 2018 Mathematics Question 12
Practice objective / multiple choice question 12 from the 2018 Igcse Model Questions Vol1 Mathematics examination.
A certain disease affects 2% of the population. A first diagnostic test has a sensitivity of 80% and a specificity of 85%. Anyone who tests positive on the first test is given a second, different test which has a sensitivity of 90% and a specificity of 95%. Assuming the tests are independent, what is the probability that a randomly selected person who tests positive on both tests actually has the disease? Give your answer as a fraction in lowest terms.
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About This Question
This is Igcse Model Questions Vol1 2018 Mathematics Question 12. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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