When is a Poisson distribution used?

When each event is dependent on the previous event
When the events are independent and occur at a constant rate
When the events are normally distributed
When the events have only two possible outcomes

A Poisson distribution is used when we are counting the number of times an event happens over a fixed interval of time or space, and the events are independent and occur at a constant average rate. It's often used to model random events such as calls to a call center or arrivals at a website.

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