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John Macko is a student at Ozark U. He does odd jobs to supplement his income. Job requests come every 5 days on the average,

John Macko is a student at Ozark U. He does odd jobs to supplement his income. Job requests come every 5 days on the average, but the time between requests is exponential. The time for completing a job is also exponential with mean 4 days.

a) What is the probability that John will be out of jobs?

b) If John gets about $50 a job, what is his average monthly income?

c) If at the end of the semester, John decides to subcontract on the outstanding jobs at $40 each. How much, on average should he expect to pay?

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