JSFiddle - React, Tailwind, and code Playground

JavaScript

var times = 0;
for (round = 1; round <= 1000000; round++) {
    var heads = 0;
    for (flips = 1; flips <= 50; flips++) {
        if (Math.random() >= 0.5) {
            heads++;
        }
    }
    if (heads >= 30) {
        times++;
    }
}

document.write(times + "<br>");
document.write(times/1000000);