Use the following results from a test for marijuana use, which is provided by a

Question

Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 149 subjects with positive test results, there are 26 false positive results: among 159 negative results, there are 3 false negative results. If one of the test subjects is randomly selected, find the probability that the subject tested negative or did not use marijuana. The Probability that a randomly selected subject tested negative or did not use marijuana is (Do not round until the final answer. Then round to three decimal places as needed.)

Explanation / Answer

here total number of subjects =159+149 =308

total number of subjects having negative results or didi not use marijuana =26+159=185

therefore probability =185/308=0.601

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