What is the Poisson random variable?

How do I compute probabilities for the Poisson random variable?

If the number of customers arriving at a bank is governed by a Poisson random variable, what random variable governs the time between arrivals?

**What is the Poisson random variable?**

The

*Poisson random variable*is a discrete random variable that is useful for describing probabilities for situations in which events (such as customer arrivals at a bank or orders placed for a product) have a small probability of occurring during a small time interval. More specifically, during a small time interval, denoted as*t*, either zero or one event will occur, and the probability of one event occurring during ...

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