text: function find_average(array) {
      //reduce callback is a, b (to sort)
      //reduce adds elements, starting with initial sum of 0 (2nd arg in reduce)
      const sum = array.reduce((a, b) => a + b, 0);
      //sum is divided by the array's length to get the average
      return sum / array.length;
  };
  
  // without comments:
  // function find_average(array) {
  //     const sum = array.reduce((a, b) => a + b, 0);
  //     return sum / array.length;
  // }
  