Write a function sum that takes an array of numbers and returns the sum of these numbers. Write a function mean that takes an array of numbers and returns the average of these numbers. The mean function should use the sum function. code example

Example: Write a function that takes an array of number values and returns the sum.

function amountTotal(amount) {
        var total = 0;
        for (i = 0; i < amount.length; ++i) {
             total += amount[i]; // add each element in an array to total
        }
        return total;// return sum of elements in array
}