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 - 2-1 Organizing Data - Exercise 2-1: 3

Answer

5-20; the number of class width should be odd so the midpoints are in the same place value as the data.

Work Step by Step

on page 45, the book gives an explanation of why there should be 5-20 classes and also states that "it is preferable but not absolutely necessary that the class width be an odd number". A summarization in your own words needs to be made to answer the second part to this question.
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