Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 5 - Discrete Probability Distributions - Review - Review Exercises - Page 237: 10


a) 0.6 b)0.5488 c)16.46 d)quite close

Work Step by Step

a) The mean: $\frac{18}{30}=0.6.$ b)$P(X=0)=\frac{0.6^0\cdot e^{-0.6}}{0!}=0.5488.$ c) Expected number:$30\cdot 0.5488=16.46.$ d)The expected number is quite close to the actual number.
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