5. [Section 4.9] The number of traffic accidents in Berkeley in 10 randomly chosen non-rainy days in 1998, which can be modeled as a Poisson distribution, is as follows: 4, 0, 6, 5, 2, 1, 2, 0, 4, 3 a. Derive the maximum likelihood estimate Å for a Poisson distribution. b. Use the data to estimate the proportion of non-rainy days that had 2 or fewer accidents that year.

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