The following data summarizes results from 1000 pre-employment drug screening te
ID: 3131546 • Letter: T
Question
The following data summarizes results from 1000 pre-employment drug screening tests. If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or a negative test result.
Positive Test Result
Negative Test Result
Subject Uses Drugs
99
6
Subject Is Not a Drug User
87
808
P(subject had a positive test result or a negative test result) =.................(Simplify your answer.)
Positive Test Result
Negative Test Result
Subject Uses Drugs
99
6
Subject Is Not a Drug User
87
808
Explanation / Answer
The following data summarizes results from 1000 pre-employment drug screening tests. If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or a negative test result.
Positive Test Result
Negative Test Result
Total
Subject Uses Drugs
99
6
105
Subject Is Not a Drug User
87
808
895
Total
186
814
1000
Number of people with positive test result =186
Number of people with negative test result =814
P(subject had a positive test result or a negative test result)
=(186+814)/1000
=1
Positive Test Result
Negative Test Result
Total
Subject Uses Drugs
99
6
105
Subject Is Not a Drug User
87
808
895
Total
186
814
1000
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