function randomString() {
        var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
        var randomstring = '';
        var string_length = 100;
        for (var i=0; i<string_length; i++) {
                var rnum = Math.floor(Math.random() * chars.length);
                randomstring += chars.substring(rnum,rnum+1);
        }
        return randomstring;
}


function randomNumber() {

                var rnum = Math.floor(Math.random() * 100) + Math.random() ;

        return rnum;
}



for(var i=0; i<200000; i++){db.students.insert({ "_id" : i, "name" : randomString(), "scores" : [ { "type" : "exam", "score" : randomNumber() }, { "type" : "quiz", "score" : randomNumber() }, { "type" : "homework", "score" : randomNumber() }, { "type" : "homework", "score" : randomNumber()} ] })};