Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 5 - Discrete Probability Distributions - 5-1 Probability Distributions - Extending the Concepts - Page 264: 34

Answer

P(X) = 0.2+0.12+0.14 $\lt$ 1 It is not a probability distribution, although the probability of each event in the sample space is between 0 and 1, the sum of the probabilities of all the events in the sample space is smaller than 1, therefore it does not fulfill the first requirement for a probability distribution.
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