Answer
It is unusually small.
Work Step by Step
We know that on average, there will be $580\times .75 = 435$ green peas. Because 428 is less than this, it follows that 428 is an unusually small number.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 5 - Discrete Probability Distributions - Review - From Data to Decision - Page 234: d
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