# There are three jobs and a single worker who works first on job 1, then on job 2, and finally on job… 1 answer below »

There are three jobs and a single worker who works first on job 1, then on job 2, and finally on job 3. The amounts of time that he spends on each job are independent exponential random variables with mean 1. Let C_{i} be the time at which job i is completed, i = 1, 2, 3, and let be the sum of these completion times. Find (a) E[X], (b) Var(X).

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There are three jobs and a single worker who works first on job 1, then on job 2, and finally on job…
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