The following data summarizes results from 10001000 pre-employment drug screenin
ID: 3334768 • Letter: T
Question
The following data summarizes results from
10001000
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
8686
66
Subject Is Not a Drug User
8181
827827
P(subject had a positive test result or a negative test
result)equals=nothing
(Simplify your answer.)
Positive Test Result
Negative Test Result
Copy to Clipboard + Open in Excel +Subject Uses Drugs
8686
66
Subject Is Not a Drug User
8181
827827
Explanation / Answer
From the population of 10,001,000 , a total of 8686 + 66 + 8181 + 827827 = 844760 either tested positive or tested negative. Therefore the probability that an employee who would be randamly selected, tests positie or negative is;
P(subject had a positive test result or a negative test result) = Favourable outcomes/Total Outcomes
= 844760/10001000
= 0.0845
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