You didn't provide any numbers but in order to find the median of something you order a given list of numbers from least to greatest. After you've done this you find the number located in the middle of the number set. If there are two numbers in the middle then you add them together and divide that number by two.
15, if you plot the points, then seperate the x and y into two seperate lines, you can create a 3,4,5 triangle to find the distance between the points.
