The mean of a Poisson random variable X,where λ is the average number of times that an event occurs in a certain period of time or space,is: A)λ B)λ² D)λ + 1

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The mean of a Poisson random variable X is λ, which is the average number of times that an event occurs in a certain period of time or space. This is a well-known property of the Poisson distribution.

The Mean of a Poisson Random Variable X,where λ Is