Answer
$z=-1$
Work Step by Step
$x=\mu-\sigma$
$z=\frac{x-\mu}{\sigma}=\frac{\mu-\sigma-\mu}{\sigma}=\frac{-\sigma}{\sigma}=-1$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 5 - Continuous Random Variables - Exercises 5.20 - 5.52 - Learning the Mechanics - Page 241: 5.27b
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