An ice cream truck is parked at a local beach and customers queue up to buy ice creams at a rate of one per minute. The arrival pattern of people buying ice cream is essentially random. It takes 40 seconds on average to serve a customer ice cream, with a standard deviation of 20 seconds. Find the following expected measures of performance for this system: the expected time in the queue for ice cream, the expected total time to get an ice cream, and the expected number of customers waiting for ice cream.
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