Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 7 - Section 7.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 378: 27

Answer

0.9074

Work Step by Step

We calculate the z-score: $z_1=\frac{x-\mu}{\sigma}=\frac{40-50}{7}=-1.43$ $z_2=\frac{x-\mu}{\sigma}=\frac{65-50}{7}=2.14$ We look up $z_1$ in Table V and get the area to the left of 0.0764. We look up $z_2$ in Table V and get the area to the left of 0.9838. We subtract the two areas to get the area in between: 0.9838-0.0764=0.9074
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