Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 3 - Data Description - 3-1 Measures of Central Tendency - Extending the Concepts - Page 126: 36

Answer

a. 36 b. 30.8 c. 16.7

Work Step by Step

a. Use the harmonic mean (HM) formula: average miles per hour=$\frac{2}{1/30+1/45}$=36 b. average miles per hour=$\frac{2}{1/40+1/25}$=30.8 c. average cost of 1 pound of nails=$\frac{2}{1/50+1/10}$=16.7
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