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19 October, 13:46

A test subject is randomly selected for a pregnancy test. What is the probability of getting a subject who is not pregnant, given that the test result is positive? Find the probability using the data table.

Positive Test Negative Test

Subject is pregnant. 78 7

Subject is not pregnant. 12 28

A. 0.10

B. 0.13

C. 0.19

D. 0.25

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Answers (2)
  1. 19 October, 17:10
    0
    You're given that the test result is positive, so only look at the first column not pregnant = 12 total = 78+12 = 90 probability = 12/90 = 0.13333333.

    Hence, the ans would be B.
  2. 19 October, 17:42
    0
    The correct answer is

    B) 0.13
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