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A street noodle vendor (one server) in Singapore can service an average of 20 customers per hour. Given an average arrival rate of 12 customers

A street noodle vendor (one server) in Singapore can service an average of 20 customers per hour. Given an average arrival rate of 12 customers per hour, calculate the mean waiting time in the queue.

4.5 minutes

2.5 minutes

1.5 minutes

3.5 minutes

5 minutes

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