What is the domain and range for the following function and its inverse?

f(x) = x2 + 3

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?

I’m still confused on how to work the percentages

The random variable x is defined as the number marking the sector in which the arrow lands when the spinner in the diagram is spun once.