At a train station, there are 7 ticket vending machines. Customers form a single waiting line to buy tickets from one of the machines. It is observed that the interarrival time is exponentially distributed with its mean equal to 1.6 minutes. On average, it takes a customer 7 minutes to buy a ticket, with a standard deviation of the time estimated as 4 minutes. On average, how many customers are waiting in the line?

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