Ok HELP ME
Im SO CONFUSED!!!

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?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

During how many months was the difference between the number of days with homework and with no homework greater than 6?