Answer
$z=-1.59$
Work Step by Step
$z=\frac{x-\mu}{\sigma}=\frac{950-1000}{31.46}=-1.59$
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 5.73 - 5.92 - Applying the Concepts - Basic - Page 256: 5.82c
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