Question: HELP I am not sure where to even start solving this. The average number of bridge construction projects that take place at any one time

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I am not sure where to even start solving this.

The average number of bridge construction projects that take place at any one time in a certain state is 7.

Using the Poisson distribution formula, what is the probability of exactly 4 bridge construction projects taking place at one time in this state? Answer choices are rounded to the hundredths place.

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