find P (condition absent | getting test result –)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Diagnostic tests of medical conditions have several results. The test result can be positive or
negative. A positive test (+) indicates the patient has the condition. A negative test (–)
indicates the patient does not have the condition. Remember, a positive test does not prove
the patient has the condition. Additional medical work may be required. Consider a random
sample of 132 patients, some of whom have a medical condition and some of whom do not.
Results of a new diagnostic test for the condition are shown.2
  Condition Present Condition Absent Row Total
Test Result + 112 20 132
Test Result – 20 57 77
Column Total 132 77 209

 
Assume that the sample is representative of the entire population. For a person selected at random, find P (condition absent | getting test result –). Round your answer to the nearest hundredth.
Group of answer choices
0.26
0.27
0.85
d. 0.74
none of these choices
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