Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine if the events are unusual. If convenient, use the appropriate probability table or technology to nd the probabilities. The mean number of births per minute in a oountry in a recent year was about three. Find the probability that the number of births in any given minute is (a) exactly four, (b) at least four, and (c) more than four. (a) P(exactly four) = (Round to four decimal places as needed.) (b) P(at least four) = (Round to four decimal places as needed.) (c) P(more than four) = (Round to four decimal places as needed.) Which of the events are unusual? Select all that apply. A. The event in part (a) is unusual. B. The event in part (b) is unusual. C. The event in part (c) is unusual. El D. None of the events are unusual. Click to select your answer(s).