The Poisson distribution is a discrete distribution that expresses the probability of a fixed number of events occurring in a fixed interval.For example,suppose we want to model the number of arrivals per minute at the campus dining hall during lunch.We observe the actual arrivals in 200 one-minute periods in 1 week.The sample mean is 3.8 and the results are shown below. 
The probabilities based on a Poisson distribution with a mean of 3.8 are shown below. 
What is the value of the first contribution to the chi-square statistic for the goodness-of-fit test to the Poisson distribution using the expected count for 0 arrivals?
Definitions:
Standard Deviation
A metric that quantifies the spread or variability of a series of values, illustrating the extent to which these values vary from their central average.
Z-Score
A measure of how many standard deviations a data point is from the mean.
Free Throw Line
A line on a basketball court 15 feet from the basket where players take unopposed shots worth one point each.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values, indicating how much the individual values differ from the mean.
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