public static boolean test_z_score() {
System.out.println("test_z_score");
boolean b = true;
ColorModel c1 = new ColorModel(1, 2, 3);
ColorModel c2 = new ColorModel(4, 5, 6);
ColorModel c3 = new ColorModel(7, 8, 19);
ColorModel c = new ColorModel(1, 10, 5);
Vector v = new Vector();
v.add(c1);
v.add(c2);
v.add(c3);