Random Picker Based On Percentage?

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#1

So I have a table with percentages 25 50 75 etc when I index that table I want to choose one based on that percentage if C has a percentage of 50 then I want it to choose C based on a 50/50 same if B has a percentage of 25 I want it to pick B %25 of the time.

I know how to calculate percentage but I do not know how to use it.
Here is my code with the table and how I calculate percentage but I don’t think calculate percentage is relevant here since I want a picker not a percentage applier:

local Table = {
	A = 0,
	B = 25,
	C = 50,
	D = 75,
	E = 100 --I know it will choose E every time this is just an example.
}

--This is how to calculate percentages but I don't think I use it here.

local Number = 100 --Number to apply percentage.
local Percentage = .25 --%25 
Number = Number * Percentage

If D has a %75 percentage chance then it should be picked more than C how do I do this?

Thanks.

P.S: Please try and give a simple answer try not to overcomplicate it but feel free to explain how it works and can be improved. Also make sure it works! Also I have looked and the other threads was not what I was looking for.

#2

I will simplify this as much as possible.

Assign one number to A, two numbers to B, four numbers to C etc.

Like so:

local table = {
   A = {1},
   B = {2, 3},
   C = {4, 5, 6, 7},
   D = {8, 9, 10, 11, 12, 13, 14, 15},
   E = {16, 17, 18, 19, 20 ,21, 22, 23, 24, 25, 26, 27, 28, 29, 30 , 31}
}

Then choose a random number between 1 and 31.

#3

I cannot do that. That will create major performance issues with my loops I plan to use. I am pretty sure that is quite inefficient to.

#4

I highly doubt a couple of tables is a huge performance problem. If you think about how percentages work, I believe this is the only way to do this anyway.

#5

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local Number = 100
local Percentage = 50
local RandomNew = Random.new()
local NextInteger = RandomNew:NextInteger(0, Number)
if NextInteger < Percentage then
	print("Selected! Chance: %" .. Percentage .. ".")
end

Example Usage:

local HttpService = game:GetService("HttpService")

local Message = Instance.new("Message")
Message.Name = HttpService:GenerateGUID(true)
Message.Parent = workspace

local Number = 100
local Percentage = 50
local RandomNew = Random.new()

local Attempt = 0
local Selected = 0

for Number2 = 1, 100 do
	local NextInteger = RandomNew:NextInteger(0, Number)
	if NextInteger < Percentage then
		Selected = Selected + 1
	end
	Attempt = Attempt + 1
end
Message.Text = "Attempt: " .. Attempt .. "\n" .. "Selected: " .. Selected .. "\n"