def center_of_points_list(points: list) -> tuple:
    """Calculate the center (average) of points in a list."""
    # Extract all x coordinates from list of points (odd list positions)
    coordinates_x = points[::2]

    # Extract all y coordinates from list of points (even list positions)
    coordinates_y = points[1::2]

    return sum(coordinates_x) / len(coordinates_x), sum(coordinates_y) / len(coordinates_y)