Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3: 136

Answer

$\{1980, 1990, 2000\}$

Work Step by Step

$A=\{x|x$ was a year in which more than $30\%$ were very happy$\}$ $B=\{x|x$ was a year in which fewer than $12\%$ were not too happy$\}$ $A\cup B=?$ From the graph we can see that: $A=\{1980, 1990, 2000\}$ $B=\{1990, 2000\}$ $A\cup B=\{1980, 1990, 2000\}$
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