Marcos is cutting ribbons for a craft project. each ribbon needs to be 3/4 yards long. if each piece is always within plus or minus 1/16 yards how long are the shortest and longest pies of i don't get it

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?