Answer
See below.
Work Step by Step
he is using the mode, which is $97\%$, but in the course the mean is used to determine the grade, which is: $\frac{97+97+75+70+55}{5}=78.8$, which is not an A.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 12 - Statistics - 12.2 Measures of Central Tendency - Exercise Set 12.2 - Page 793: 71
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