Historical evidence indicates that times between fatal accidents on scheduled american domestic passenger flights have an approximately exponential distribution. assume that the mean time between accidents is 43 days.
(a) if one of the accidents occurred at 12: 00 am on june 1 of a randomly selected year in the study period, what is the probability that another accident occurred that same month? (round your answer to four decimal places.)
b what is the variance of the times between accidents?

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