Statistics: Informed Decisions Using Data (4th Edition)

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

Chapter 6 - Review - Review Exercises - Page 356: 12d

Answer

$P(1\leq~x\leq3)=0.711$

Work Step by Step

$P(1\leq~x\leq3)=P(1)+P(2)+P(3)=\frac{(0.05\times30)^1}{1!}e^{-0.05\times30}+\frac{(0.05\times30)^2}{2!}e^{-0.05\times30}+\frac{(0.05\times30)^3}{3!}e^{-0.05\times30}=\frac{1.5}{1}e^{-1.5}+\frac{2.25}{2}e^{-1.5}+\frac{3.375}{6}e^{-1.5}=0.711$
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