Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 6 - Review - Test - Page 357: 10b

Answer

$P(x\lt3)=0.9921$

Work Step by Step

$P(x\lt3)=P(0)+P(1)+P(2)=\frac{(0.05\times8)^0}{0!}e^{-0.05\times8}+\frac{(0.05\times8)^1}{1!}e^{-0.05\times8}+\frac{(0.05\times8)^2}{2!}e^{-0.05\times8}=\frac{1}{1}e^{-0.4}+\frac{0.4}{1}e^{-0.4}+\frac{0.16}{2}e^{-0.4}=0.9921$
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