2. Poisson Random Variable Provides model for data that represent the number of occurrences of a specified event in a given unit of time X represents the number of events that occur in a period of time or space during which an average of such events can be expected to occur

3. Poisson Random Variable Standard Deviation

4. Poisson Approximation to the Binomial Distribution Poisson probability distribution provides an accurate approximation to binomial probabilities N must be large µ=np is small, preferably np < 7