Answer
1.00
Work Step by Step
$P(z<2.3 or z>-1.2)=P(z<2.3)\cup P(z>-1.2)$
this covers the whole area under the distribution curve,
the result is $1.$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 6 - The Normal Distribution - 6-1 Normal Distribution - Extending the Concepts - Page 324: 59
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