Answer:
The Poisson distribution uses the shape parameter denoted by λ.
Explanation:
A Poisson distribution is used to describe the distribution of the number of events that take place in a fixed interval of time.
For instance, number of customers arriving at a bank in an hour or the number of typos encountered in a book every 50 pages.
The Poisson distribution uses the shape parameter to compute the probabilities of different events.
The shape parameter is defined as the average number of occurrence in a given time interval. It is usually denoted by λ.
The probability mass function of a Poisson distribution is:
