Allug's Coffee Shop decides to install an automatic coffee vending machine outside one of its stores to reduce the number of people standing in line inside. Mehmet Allug charges dollar 3.50 per cup. However, it takes too long for people to make change. The service time is a constant 2.00 minutes, and the arrival rate is 20 per hour (Poisson distributed).
The average wait time in the line= minutes (round your response to two decimal places).