Answer
Not disjoint.
Work Step by Step
Two events are disjoint if they cannot happen at the same time. Here, it is possible to believe in UFOs and devils at the same time, therefore these events are not disjoint.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 4 - Probability - 4-3 Addition Rule - Page 153: 7
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