Answer
Not an exchange matrix.
Work Step by Step
A matrix is an exchange matrix if the sum of each column is $1$. Here the sum of the second column is $0.7+0.4=1.1\ne1$, thus the matrix is not an exchange matrix.
Linear Algebra: A Modern Introduction
by Poole, David
Published by
Cengage Learning
ISBN 10:
1285463242
ISBN 13:
978-1-28546-324-7
Chapter 3 - Matrices - 3.7 Applications - Exercises 3.7 - Page 247: 21
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