FizzBuzz++ - using nested functions

gistfile1.js

// Codeacademy.com project, "FizzBuzz++"
// Goal: count from 1 to N, and output counts, sums and averages of all numbers divisible by both 3 and 5 

var FizzBuzzPlus = {

    isFizzBuzzie: function(value){
        if (value%3===0 && value%5===0)
        return false;
        else if (value%3===0 || value%5===0)
        return true;
        else return false;
    },
    getFizzBuzzSum: function(value){
        var sum = 0;
        for(i=0; i<value; i++){
            if (this.isFizzBuzzie(i)){
                sum = sum + i;
            }
        }
        return sum;
    },
    getFizzBuzzCount: function(value){
        var count = 0;
        for(i=0;i<value;i++){
            if (this.isFizzBuzzie(i)) { count++ };
        }
        return count;
    },
    getFizzBuzzAverage: function(value){
        var average = (this.getFizzBuzzSum(value)/this.getFizzBuzzCount(value));
        return average;
    }
};