4. A certain highway has an average of 4 car accidents each week. (a) What is the probability that at least one accident occurs this week? (b) What is the probability that exactly 7 accidents occur during the next two weeks? (c) What is the probability that at least one accident occurs tomorrow?

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A: transition probability matrix is given:

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Q: how that the variance of a geometric random variable X; is given by V ar(X) = q/p^2 .

A:

Q: A random variable X has cumulative distribution function

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