Question: LF Bank has 3 tellers serving customers through a shared line where the next customer in line goes to the first available teller. Each teller

LF Bank has 3 tellers serving customers through a shared line where the next customer in line goes to the first available teller. Each teller can serve 30 customers per hour with exponential service times and the customers arrive at a rate of 87 per hour, according to a Poisson distribution. On average, how many customers are in the system?

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