Question: Your little sister started operating a lemonade stand. The average time she spends with a customer (greeting, taking the order, preparation, receiving payment) is exponentially

Your little sister started operating a lemonade stand. The average time she spends with a customer (greeting, taking the order, preparation, receiving payment) is exponentially distributed around an average of 1 minute per customer. On a typical day, a new customer stops by every 2 minutes (assume customers arrive according to a Poisson distribution). When there are no customers waiting in line or no customers being served, your sister sits in her chair and reads her book. On average, how much time will a customer spend waiting in line at her lemonade stand?

A. 0.5 B. 2 C. 1 D. 2.5 E. 3

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