8) the monthly worldwide average number of airplane crashes of commercial airlines is 3.5. what is the probability that there will be (a) at least 2 such accidents in the next month; (b) at most 1 accident in the next month? explain your reasoning!

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?