Chapter 2 - Frequency Distributions and Graphs - 2-1 Organizing Data - Exercise 2-1 - Page 51: 3

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

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.