(function () {
function calcularMedia() {
var total = 0;
var qtd = arguments.length;
var x = 0;
while (typeof arguments[x] === "number") {
total += arguments[x];
x++;
}
return total / qtd;
}
var media1 = calcularMedia(4, 0, 10, 10);
var media2 = calcularMedia(2, 3);
console.log("A media1 é: ", media1);
console.log("A media2 é: ", media2);
})();