Printing the average of integers in a stream

Problem

Given a stream of integers, print out the average of all the integers seen so far at each point in the stream.
Input: 1,2,3,4,5
Output:
1
1.5
2
2.5
3

Solution

This solution is in JavaScript. Our A.I. can create solutions in multiple languages.

kayakane

// Solution:
// The solution below is optimal because it only uses one loop and one variable to store the average.
// The average is calculated by adding the current number to the previous average and dividing by 2.
// This is optimal because it is O(n) time complexity and O(1) space complexity.

function printAverage(arr) {
  let average = 0;
  for (let i = 0; i < arr.length; i++) {
    average = (average + arr[i]) / 2;
    console.log(average);
  }
}

printAverage([1, 2, 3, 4, 5]);