Answer
{10,14,16}
Work Step by Step
{x| x is a time of the day when the average level of happiness was 1}
In the graph we can see that at 10 AM , 14 hour and 16 hour the average level of happiness was 1.
So set A = {10,14,16}
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.1 Basic Set Concepts - Exercise Set 2.1 - Page 60: 114
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