code: def moving_average(arr: np.ndarray, n: int = 3) -> np.ndarray:
      
      ret = np.cumsum(arr, dtype=float)
      ret[n:] = ret[n:] - ret[:-n]
      return ret[n - 1:] / n
docs: Calculate the moving overage over an array.
  
      Algorithm from: https://stackoverflow.com/a/14314054
  
      Args:
          arr (np.ndarray): Array over which to calculate the moving average.
          n (int): Number of elements over which to calculate the moving average. Default: 3
      Returns:
          np.ndarray: Moving average calculated over n.