Suppose that a company has determined that the the number

Chapter 5, Problem 139E

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QUESTION:

Suppose that a company has determined that the the number of jobs per week, \(N\), varies from week to week and has a Poisson distribution with mean \(\lambda\). The number of hours to complete each job, \(Y_{i}\), is gamma distributed with parameters \(\alpha \text { and } \beta\). The total time to complete all jobs in a week is \(T=\sum_{i=1}^{N} Y_{i}\). Note that \(T\) is the sum of a random number of random variables. What is
a \(E(T \mid N=n)\)
B \(E(T)\), the expected total time to complete all jobs?

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QUESTION:

Suppose that a company has determined that the the number of jobs per week, \(N\), varies from week to week and has a Poisson distribution with mean \(\lambda\). The number of hours to complete each job, \(Y_{i}\), is gamma distributed with parameters \(\alpha \text { and } \beta\). The total time to complete all jobs in a week is \(T=\sum_{i=1}^{N} Y_{i}\). Note that \(T\) is the sum of a random number of random variables. What is
a \(E(T \mid N=n)\)
B \(E(T)\), the expected total time to complete all jobs?

ANSWER:

Step 1 of 3

Given that,

Suppose that a company has determined that the number of jobs per week, N, varies from week to week and has a Poisson distribution with mean \(\lambda\).

That is, \(E(N)=\lambda\)

The number of hours to complete each job, \(Y_{i}\) , is gamma distributed with parameters \(\alpha\) and \(\beta\). The total time to complete all jobs in a week is \(T=\sum_{i=1}^{N} Y_{i}\).

T is the sum of a random number of random variables.

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