Answer
z > 1.875
Work Step by Step
$z = \frac{x̅ - µ}{σ/\sqrt n} = \frac{215 - 200}{80/\sqrt 100}$
z = 1.875
Hence z > 1.875
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 8 - Inferences Based on a Single Sample - Exercises 8.20 - 8.37 - Learning the Mechanics - Page 364: 8.25a
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