Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0321911210
ISBN 13: 978-0-32191-121-6

Chapter 5 - Normal Probability Distributions - Review Exercises - Page 287: 38

Answer

Answer: z $\approx$ -1.28

Work Step by Step

We can use the standard normal distribution tables to find this. There is no 0.1 probability on the table however so you have to use the closest value 0.1003 which corresponds to a z score of approximately -1.28. The answer can also be found using the NORM.INV function in excel.
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