Answer
The number of people in the table is sum of all counts:
6432+5640+2450+1843+2124+1069 = 19558
Work Step by Step
As given above
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 6 - Two-Way Tables - Apply Your Knowledge - Page 166: 6.2a
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