How can a JavaScript function be created to choose a random whole number from an array, to ultimately achieve a specific average with repeated trials?

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Here is an example JavaScript function that chooses a random whole number from an array and repeats trials until a specific average is achieved:

function randomNumToAvg(targetAvg, numList) {
  let sum = 0;
  let count = 0;

  // sum up array items
  for(let i=0; i<numList.length; i++) {
    sum += numList[i];
    count++;
  }

  // loop until target average is reached
  while(sum/count < targetAvg) {
    // choose a random number from array
    let randIndex = Math.floor(Math.random()*numList.length);
    let randNum = numList[randIndex];

    // add random number to sum and increment count
    sum += randNum;
    count++;
  }

  // return average when target is achieved
  return sum/count;
}

To use this function, simply pass in the target average and an array of whole numbers:

// example usage
let targetAvg = 5;
let numList = [1, 2, 3, 4, 5, 6, 7, 8, 9];

let result = randomNumToAvg(targetAvg, numList);

console.log(result);

This function will choose random numbers from the input array until the average of all numbers is greater than or equal to the target average. The function then returns the final average achieved.