On New York's Verrazano Narrows bridge, traffic accidents occur at a mean rate of 2.0 crashes per

Question:

On New York's Verrazano Narrows bridge, traffic accidents occur at a mean rate of 2.0 crashes per day. Let X be the number of crashes in a given day.
(a) Justify the use of the Poisson model.
(b) What is the probability of at least one crash?
(c) Fewer than five crashes?
d) Construct the probability (Excel or Appendix B), make a graph of its PDF, and describe its shape. Distribution
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