Statistics for the Life Sciences (5th Edition)

Published by Pearson
ISBN 10: 0-32198-958-9
ISBN 13: 978-0-32198-958-1

Chapter 3 - Probability and the Binomial Distribution - Exercises 3.2.1 - 3.2.8 - Page 93: 3.2.5

Answer

No formula associated with this problem.

Work Step by Step

To start this problem, a probability tree should be drawn. The probability tree is attached below. P(answering correctly) = P(knows and guesses correctly) + P(doesn't know and guesses correctly) P(answering correctly) = (0.4)(1.0)+(0.6)(0.2) P(answering correctly) = 0.4 + 0.12 P(answering correctly) = 0.52
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