With filter

HTML

<script>
    
    var _consoleLog = console.log;
    
    console.log = function(){
        var name = _consoleLog.apply(console,arguments);
        var str = "";
        for(var index in arguments){
            if(Array.isArray(arguments[index])){
               arguments[index] = arguments[index].map(function(item){
                    if(typeof item == "object"){
                        item = JSON.stringify(item,null,4);
                    }
    
                    return item;
               });
               str += arguments[index]+" ";
                
            } else if(typeof arguments[index] == "object"){
                str = JSON.stringify(arguments[index],null,4);
            } else {
                str += arguments[index]+" ";
            }
        }
        $('body').append(str);
    }
   
</script>

JavaScript

var numeros = [1, 2, 3, 4, 5, 6];
var total = numeros.reduce(function(total, numero){
	return (total + numero);
}, 0);
console.log(total/numeros.length);