Answer
P(Negative & Non-user | non-user) = P(Negative for non-user) / P(non-user)
= (881/1000) / (900/1000)
= 0.99
Work Step by Step
As given in answer
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 3 - Probability - Exercises 3.138 - 3.153 - Applying the Concepts - Basic - Page 167: 3.145b
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