How would YOU run different sections of code based on a random probability?

Nothing incredibly obvious

--Set up the table of items in an array-style table to be able to sort it
local items = { --Chances add up to 100%
	{'Orange',50}, --{Item, Chance}
	{'Apple',20},
	{'Banana',30},
}
--edit: added normalizing function
local function normalize(t) 
	local total = 0
	for i=1, #t do 
		total = total + t[i][2] 
	end 
	for i=1, #t do 
		t[i][2] = t[i][2] * (100/total) 
	end 
end

normalize(items)

table.sort(items,function(value1,value2) --table.sort accepts a custom sort function
	return value1[2] < value2[2] --sort the table by least chance to most chance
end)
local function randomItem() --define a function that will choose a random item
	local n = math.random() * 100 --choose a random number from 0 to 100
	local currentValue = 0 --current chance
	local chosen --define a variable to be set with the item that is picked
	for i=1, #items do
		currentValue = currentValue + items[i][2] --add to the chance with the item[i]'s chance
		--check if the current chance is greater than the number picked
		if currentValue >= n then 
			chosen = items[i][1] -- set chosen to the item
			break --break the for loop
		end
	end
	return chosen --return the chosen
end

local picked = {}
for i=1, 100 do	
	local item = randomItem()
	picked[item] = (picked[item] or 0) + 1
end
print(picked.Apple)
print(picked.Banana)
print(picked.Orange)
--This should print roughly 20, 30 and 50