**Questions answered in this
chapter:**

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 short time interval. More specifically, during a short time
interval, denoted as *t*, either zero or one ...

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