Answer
Standard normal distribution.
Work Step by Step
It is called standard because we can convert any normal distribution into a standard normal distribution by converting any value $x$ into a z-score:
$z=\frac{x-\mu}{\sigma}$
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 - Understanding the Principles - Page 241: 5.21
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