Percent chance

Ok so i am trying to have a 3 different functions that all have varying chances of occuring. I remember a while back seeing a way to make a random number generator using a loot table, where you could have the weights for each item be the percentaes, and then use the type of item generated to do different things, but i do not remember the way this was done. I am basically wondering if there is a way to run a different function depending on the item generated from the following loot table? { "pools": [ { "rolls": 1, "entries": [ { "type": "minecraft:item", "name": "minecraft:green_wool", "weight": 75 }, { "type": "minecraft:item", "name": "minecraft:blue_wool", "weight": 20 }, { "type": "minecraft:item", "name": "minecraft:purple_wool", "weight": 5 } ] } ] }