Answer
P(correct) = No, of Guesses / Total
= 1/120
Hence the friend has 1 out of 120 chance to guess correctly.
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 301: 12.50b
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