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 2 - Frequency Distributions and Graphs - 2-2 Histograms, Frequency Polygons and Ogives - Exercises 2-2 - Page 66: 9

Answer

The histogram below shows the comparison of the two distributions. The number of cities remain unchanged for the 15-19 and 40-49 $g/m^3$ ranges. In the 25-39 $g/m^3$ range, the number of cities now is less than that of 5 years ago. And the number of cities now for the 10-14 $g/m^3$ region is more than that of 5 years ago.
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