formative computation

student's scores on four subjects
No	Y	X1	X2	X3
1	40	54	54	60
2	62	62	70	78
3	42	42	42	50		Y = B.INDONESIAN
4	60	64	72	80		X1= B.INGGRIS
5	58	64	72	80		X2= CHEMISTRY
6	62	78	86	94		X3=MATHEMATIC
7	58	60	72	78
8	74	80	88	98			Y	X1	X2	X3
9	54	62	66	76		Y	1
10	60	62	72	80		X1	0.729385	1
11	64	80	82	98		X2	0.806203	0.933243	1
12	56	62	64	76		X3	0.750196	0.952009	0.976299	1
13	68	74	86	100
14	76	78	84	92
15	64	62	68	76			Y	X1
16	68	64	70	78		Y	1
17	68	62	70	78		X1	0.729385	1
18	56	60	62	72
19	66	64	72	80
20	64	62	76	84
21	60	62	72	80
22	64	80	82	98
23	56	62	64	76
24	68	74	86	100
25	76	78	84	92
26	64	62	68	76
27	68	64	70	78
28	68	62	70	78
29	56	60	62	72
30	66	64	72	80