Get a random number focused on center

Question

Is it possible to get a random number between 1-100 and keep the results mainly within the 40-60 range? I mean, it will go out of that range rarely, but I want it to be main

Answer 1

I might do something like setup a "chance" for the number to be allowed to go "out of bounds". In this example, a 20% chance the number will be 1-100, otherwise, 40-60:

$(function () {
    $('button').click(function () {
        var outOfBoundsChance = .2;
        var num = 0;
        if (Math.random() <= outOfBoundsChance) {
            num = getRandomInt(1, 100);
        } else {
            num = getRandomInt(40, 60);
        }
        $('#out').text(num);
    });
    
    function getRandomInt(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
});

Generate

fiddle: http://jsfiddle.net/kbv39s9w/