Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 4 - Probability - 4-5 Multiplication Rule: Complements and Conditional Probability - Page 175: 34



Work Step by Step

There are three possible outcomes, that includes at least one head: HT, TH, HH, and one which doesn't: TT. From the 4 possible outcomes, 3 can happen according to the professor, 1 outcome is good, therefore: $P(HH)=\frac{1}{3}=0.33333$
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