Use the following results from a test for marijuana use, which is provided by a
ID: 3270355 • Letter: U
Question
Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 140 subjects with positive test results, there are 23 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
P( Negative or did not use majurina)
= (23+3)/(140+159)
= 0.087
So, answer is 0.087