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: 31

Answer

P(X) = 1/6+2/6+3/6=1 It is a probability distribution, because the sum of the probabilities of all the events in the sample space equal to 1, and the probability of each event in the sample space is between 0 and 1, it fulfills the two requirements for a probability distribution.
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