Choose the breadth of the random number (0 up to, but not including, 100 would be 100 for range)
Choose the starting number (1 up to, but not including, 10 would be 1 for offset, 9 for range)
Choose the multiplier applied to the result (~5, ~10, ~15 would be 5 for interval, 1 for offset, 2 for range)
Create a single random number from offset up to (but never including) offset + range. With optional offset, the distance between the result numbers can be adjusted with interval. Matches randomInteger, which gives the whole numbers of the same span.