An Introduction to Mathematical Statistics and Its Applications (6th Edition)

Published by Pearson
ISBN 10: 0-13411-421-3
ISBN 13: 978-0-13411-421-7

Chapter 2 Probability - 2.2 Sample Spaces and the Algebra of Sets - Questions - Page 23: 28

Answer

(a) $A^c=\{x: -\infty\lt x\le0\ \cup\ 5\le x\lt\infty \}$ (b) $A\cap B=\{x: 3\le x\lt5 \}$ (c) $A\cup B=\{x: 0\lt x\le7 \}$ (d) $A\cap B^c=\{x: 0\lt x\lt3 \}$ (e) $A^c\cup B=\{x: -\infty\lt x\le0\ \cup\ 3\le x\lt\infty \}$ (f) $A^c\cap B^c=\{x: -\infty\lt x\le0\ \cup\ 7\lt x\lt\infty \}$

Work Step by Step

Given $S=\{x: 0\le x\le10 \}$ $A=\{x: 0\lt x\lt 5 \}$ $B=\{x: 3\le x\le7 \}$ We can find: (a) $A^c=\{x: x\le0\} \cup\ \{x:x\ge 5 \}$ (b) $A\cap B=\{x: 3\le x\lt5 \}$ (c) $A\cup B=\{x: 0\lt x\le7 \}$ (d) $A\cap B^c=\{x: 0\lt x\lt3 \}$ (e) $A^c\cup B=\{x: -\infty\lt x\le0\} \cup\{x: 3\le x\lt\infty \}$ (f) $A^c\cap B^c=\{x: -\infty\lt x\le0\ \cup\ 7\lt x\lt\infty \}$
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