docs: public void printClusterCenter(Writer stream) throws IOException {
  		stream.write(String.valueOf(this.numPoints));
  		for (int j = 0; j < this.sumPoints.length; j++) {
  			stream.write(' ');
  			stream.write(String.valueOf(this.sumPoints[j] / this.numPoints));
  		}
  		stream.write(System.getProperty("line.separator"));
  	}