The potholes on a major highway in the city of Chicago occur at the rate of 3.4

Question:

The potholes on a major highway in the city of Chicago occur at the rate of 3.4 per mile. Compute the probability that the number of potholes over 3 miles of randomly selected highway is
(a) Exactly seven. Interpret the result.
(b) Fewer than seven. Interpret the result.
(c) At least seven. Interpret the result.
(d) Would it be unusual for a randomly selected 3-mile stretch of highway in Chicago to contain more than 15 potholes?

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