Bess visited a library that had floors above ground level. The library also had floors below ground. While visiting the library, Bess entered on the ground level, went to both the third and fourth floor above ground, returned to the ground- level floor, and then went to the third floor below ground. When she finished, she returned to the ground level. Which set of integers best represents the floors Bess visited at the library.

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?