Answer
4 billion
Work Step by Step
10.1 billion - 6.1 billion = 4 billion
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 10 - Statistics - Summary Exercises - Graphs - Page 728: 8
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