Answer
Option a
Work Step by Step
$P(At least one test positive) = 1 - P(both test negative)\\
P(Both test positive) = 1 - P(Both test negative)\\
= 1 - (0.1)(0.2)\\
= 0.98$
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 13 - General Rules of Probability - Check Your Skills - Page 320: 13.19
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