JSFiddle - React, Tailwind, and code Playground

JavaScript

var totalAbove  =0;
var totalBelow = 0
for(var i=0;i<10000;i++){
    var randomNumber = Math.ceil(Math.random()*1000)
    if(randomNumber > 500){
        totalAbove++
    }else{
        totalBelow++
    }
}

var belowSplit = (totalBelow / 10000) * 100
var aboveSplit = (totalAbove / 10000 ) * 100
alert("Above 500: " + totalAbove + "\n" + "Below 500: " + totalBelow + "\n split: " + belowSplit + "/" + aboveSplit);