Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0-32191-121-0
ISBN 13: 978-0-32191-121-6

Chapter 5 - Normal Probability Distributions - Review Exercises - Page 287: 40

Answer

$z = -0.84$

Work Step by Step

The area 0.20 is not in the table. Since 0.2005 is the closest value to 0.20 in the table, we use its corresponding z score of -0.84. Another method is to use technology if convenient. This would give a z score value of approximately -0.8416.
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