Answer
0.303
Work Step by Step
$p=200/400=0.5$ use Poisson formula with $n=1, \mu=np=0.5, X=1$
we have $P=\frac{0.5^1e^{-0.5}}{1!}=0.303$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 5 - Discrete Probability Distributions - 5-4 Other Types of Distributions - Exercises 5-4 - Page 299: 10
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