The following data summarizes results from 10001000 pre-employment drug screenin
ID: 3334782 • 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
9696
77
Subject Is Not a Drug User
9898
799799
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
9696
77
Subject Is Not a Drug User
9898
799799
Explanation / Answer
From the population of 1000 , a total of 96 + 7 + 98 + 799 = 1000 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
= 1000/1000
= 1
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