What is the hcf of 12 45 and 75​

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?

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top