Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 11 Data Analysis and Statistics - 11.3 Use Normal Distributions - 11.3 Exercises - Skill Practice - Page 760: 27



Work Step by Step

$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$ Hence here the z-score is: $\frac{65-64}{7}\approx 0.1,\frac{45-64}{7}\approx -2.7$ Then, using the table: $P(45\lt x\leq 65)=P(x\leq 65)-P(x\leq45)\approx P(z\leq0.1)-P(z\leq-2.7)=0.5398-0.0035=0.5363$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.