Sec 66
No	ID	Grade/20
1	251583	15.8
2	251643	15.3
3	251959	13.5
4	253965	17.1
5	255307	11.7
6	255743	9.5
7	255931	16.6
8	256147	14.5
9	256459	15.3
10	257403	15.6
11	257963	15.7
12	258253	16.6
13	258591	13.8
14	258737	11.6
15	258767	10.7
16	259153	15.1
17	259587	12.0
18	259591	14.0
19	259871	11.6
	Average	14.0
	STD	2.2