Answer
The correct answer is (c) either a pie chart or a bar graph.
Work Step by Step
That is because the grades (A, B, C, D, F) are categorical variables and can be represented by both a bar graph and a pie chart.
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 - Check Your Skills - Page 37: 1.14
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