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Consider a diagnostic test for a disease. Sensitivity of the test is 90 % (i.e. 90 % of people with the disease will get a positive test result). Specificity of the test is 90% (i.e, 90 % of people without the disease will get a negative test result). Assuming that the disease is prevalent in 10 out of 100 people, what is the probability that a person has the disease if the test gives a positive result