Thinking Mathematically (6th Edition)

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: 113

Answer

{12,19}

Work Step by Step

{x| x is a time of the day when the average level of happiness was 3} In the graph we can see that at 12 noon and 19 hours the average level of happiness was 3. So set A = {12,19}
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