A study was conducted to determine if the results of a test indicated whether a disease was present or not in 200 trials. The results are listed in the table below.  Presence of Disease Test Result   Total + Result −  Result Present 84 3 87 Not Present 7 106 113 Total 91 109 200   What is the probability that a randomly selected subject received positive results given that the disease was present? Note: - Select the correct answer below as a percent rounded to 3 significant digits.  - Show your calculations on your scrap paper for full marks.    a. 42%   b. 96.6%   c. None of the above.   d. 96.5%

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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A study was conducted to determine if the results of a test indicated whether a disease was present or not in 200 trials. The results are listed in the table below. 

Presence of Disease

Test Result

 

Total

+ Result

−  Result

Present

84

3

87

Not Present

7

106

113

Total

91

109

200

 

What is the probability that a randomly selected subject received positive results given that the disease was present?

Note:

- Select the correct answer below as a percent rounded to 3 significant digits. 

- Show your calculations on your scrap paper for full marks. 

  a.

42%

  b.

96.6%

  c.

None of the above.

  d.

96.5%

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