Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0-32191-121-0
ISBN 13: 978-0-32191-121-6

Chapter 2 - Descriptive Statistics - Section 2.1 Frequency Distributions and Their Graphs - Exercises - Page 49: 15

Answer

A. Class width = 11 B. Class midpoints = 25,36,47,589,69,80,91 C. Class boundaries = (19.5-30.5), (30.5-41.5), (41.5-52.5), (52.5-63.5), (63.5-74.5), (74.5-85.5), (85.5-96.5)

Work Step by Step

A. Using the table, find the difference between either two sequential lower class limits, or two sequential upper class limits (i.e. 31-20, or 41-30) B. add one set of classes and divide by two. (i.e, [20+30]/2=25) C. -.5 to lower class boundary, +.5 to upper class boundary
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