Answer
True.
Work Step by Step
In a probability model, the sum of all the probabilities is the probability of the sample space, which is $1$, hence the statement is true.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 13 - Counting and Probability - 13.3 Probability - 13.3 Asses Your Understanding - Page 864: 4
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