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4. The ticket booth on the Tech campus is operated by one per- son, who is selling tickets for the annual Tech versus State football game on Sat- urday. The ticket seller can serve an average of 12 customers per hour; on average, 10 customers arrive to purchase tickets each hour (Poisson dis- tributed). Determine the average time a ticket buyer must wait and the portion of time the ticket seller is busy.

Fig: 1