JSFiddle - React, Tailwind, and code Playground

JavaScript

const slots = 6;
const randomNums = 10000;

const cov = {}

for( let i = 0; i < randomNums; i++ ){
	const random = Math.floor( Math.random() * slots + 1 );
  if( cov[random] === undefined ){
  	cov[random] = { c: 1 }
  } else {
  	cov[random].c++;
  }
}

for( let num in cov ){
	cov[num].c = 100 / (randomNums / cov[num].c) + ' %';
}

console.log( cov );