Find the mean and standard deviation of S = , X %3D =D1 Confirm that S Poisson(13) Compute P(S = 0).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 31E
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6. A transportation department is considering placing stop lights at a busy 4-way-stop intersection. Let
X1, X2, X3, X4 represent the number of drivers arriving per minute at the respective stop signs. Assume-
these to be four mutually independent Poisson random variables with respective means of 2, 5, 4 and
2.
(a) Find the mean and standard deviation of S = Xị.
(b) Confirm that S ~
Poisson(13)
(c) Compute P(S = 0).
Transcribed Image Text:6. A transportation department is considering placing stop lights at a busy 4-way-stop intersection. Let X1, X2, X3, X4 represent the number of drivers arriving per minute at the respective stop signs. Assume- these to be four mutually independent Poisson random variables with respective means of 2, 5, 4 and 2. (a) Find the mean and standard deviation of S = Xị. (b) Confirm that S ~ Poisson(13) (c) Compute P(S = 0).
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