Final letter grade were determined by the following scale:

                  D   44-56
                  C   56-70.5
                  B   70.5-81  

with below 44 an E and above 81 an A.
AAAAAAAAAAAAA
1812	92.50
9912	88.63
6890	88.63
0055	88.3 
3921	86.89
4668	86.50
1610	84.17
3426	81.21
BBBBBBBBBBBBB
1404	78.13
5049	74.79
6133	74.61
0229	74.59
8751	73 90
3484	73.18
8013	71.25
7196	70.99
2366	70.83
CCCCCCCCCCCCC
4927	69.99
0636	69.79
9136	69.78
1599	68.68
3438	68.64
9855	66.99
0030	66.69
5396	65.44
5120	65.36
8548	65.20
9757	64.52
4318	64.20
2698	63.11
3849	62.17
9881	62.04
1440	61.65
7657	60.97
6029	60.42
0193	60.26
2134	59.80
2933	58.69
8840	57.94
9568	57.64
2991	57.14
2917	56.29
DDDDDDDDDDDDD
8005	53.68
2340	48.08
4949	45.26
8143	45.23
EEEEEEEEEEEEE
1503	41.99
5465	37.48
7039	36.82
7394	33.9 
7365	26.08
2061	22.38
6050	20.11
0365	19.63
5342	15.11
0630	13.97
7742	11.29