Michael has a credit card with an apr of 15.33%. it computes finance charges using the daily balance method and a 30-day billing cycle. on april 1st, michael had a balance of $822.05. sometime in april, he made a purchase of $77.19. this was the only purchase he made on this card in april, and he made no payments. if michael’s finance charge for april was $10.71, on which day did he make the purchase?

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?