Answer
The variability is from 59% to 88%. The midpoint is 80%.
Work Step by Step
Please see the attached stemplot.
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 1 - Picturing Distributions with Graphs - Apply Your Knowledge - Page 32: 1.10a
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