Number Range statistics divide the whole number pool into several chunks. Each chunk has either 5 or 10 numbers. So when playing e.g. x/49 lottery the pool will be divided into ten chunks of five numbers (1-5, 6-10, 11-15, ... , 41-45, 46-49) and five chunks of ten numbers (1-10, 11-20, ... , 41-49).
The statistics evaluate each ticket position and show which chunk the number at the given position fall into.
For example the latest draw in Expert Lotto 6/49 Demo Lottery is 23-29-36-42-44-47 so when using 5-number ranges the first number falls into range 21-25. When using 10-number ranges the first number falls into range 21-30.
These statistics are available in summary form and also as per-ticket properties.