3. Refer to the following table to answer this question. Assuming that 1 person
ID: 3129143 • Letter: 3
Question
3. Refer to the following table to answer this question. Assuming that 1 person is randomly selected from the 99 people included in the study, find the probability of selecting a subject who is pregnant or had a positive test result.
Pregnancy Test Results
Positive Test Result
(Pregnancy is Indicated)
Negative Test Result
(Pregnancy is not Indicated)
Subject is Pregnant
80
5
Subject is not Pregnant
3
11
Pregnancy Test Results
Positive Test Result
(Pregnancy is Indicated)
Negative Test Result
(Pregnancy is not Indicated)
Subject is Pregnant
80
5
Subject is not Pregnant
3
11
Explanation / Answer
Probability that the subject is pregnant =85/99
Probability that the test result is positive =83/99
probability that the subject is positive and the test result is positive=80/99
The probability of selecting a subject who is pregnant or had a positive test result. is
= (85/99) +(83/99) -(80/99) =88/99= 8/9 =0.89
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