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: 116

Answer

{20, 21, 22}

Work Step by Step

{x| x is a time of the day when 3$\lt$ average level of happiness $\leq$ 4} In the graph we can see that at 20 hour,21 hour and 22 hour the average level of happiness was greater than 3 but less than equal to 4. So set A = {20, 21, 22}
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