A New Test Has Been Developed To Determine Whether A Given Student Is Overstress

A new test has been developed to determine whether a given student isoverstressed. This test is 95% accurate if the student is not overstressed, but only 85%accurate if the student is in fact overstressed. It is known that 99.5% of all studentsare overstressed. Given that a particular student tests negative for stress, what is theprobability that the test results are correct, and that this student is not overstressed?

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