There are several ways to get numbers out of Advanced Random. Here is the manual entry for it that explains everything it can do: construct.net/en/make-games/manuals/construct-3/plugin-reference/advanced-random. There is also 2 examples on the C3 start page under "Advanced Examples" named "Noise textures" and "Procedural terrain generation".
It all depends on what kind of random numbers you need. If you need to a simple random number between 2 numbers, then just use the random system expression (search for random).
If you are looking for something more complicated then that, then the Advanced Random plugin can do 4 things.
1) Generate organized noise (perlin noise for example)
2) Generate a gradient (I don't many people use this)
3) Probability table
4) Permutation table
A use case for organized noise is for generating landscapes or procedural textures.
The gist of a Probability table is being able to easily do weighted probabilities. Like for loot drops, 3 items each have 30% to drop but 1 item is rare and has only 10% to drop.
The gist of a Permutation table is being able to draw from a randomly shuffled sequence of numbers, like a deck of cards. That way the random numbers never repeat.
Hope this helps. Sorry if you know all this already. It's kind of hard to understand exactly what you're asking.