averageWIthReduce.js

const example = [1,2,5,7,9,11,13,17,19]
const example2 = [-2,5,8,14,1,5,-9,-10,2]

avgWithReduce = function(arr) {
  return arr.reduce(function(acc, number) {
    // add accumulator to average of each number
    return acc + number/arr.length
    // set initial value to 0
  }, 0)
}

console.log(avgWithReduce(example))  // 9.333
console.log(avgWithReduce(example2)) // 1.555