Answer
There are four choices of pairs containing Mu-Ling, and probability of each choice = 1/4, so:
P(Mu-Ling is chosen) = 4 x 1/10 = 4/10 = 0.4
Work Step by Step
As given above
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 12 - Introducing Probability - Chapter 12 Exercises - Page 300: 12.47c
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