I would use a vlookup of the value caculated from the average+0.25

refering to a range of data like
1 E-
2 E
3 E+
4 D-
5 D
6 D+
7 C-
8 C
9 C+
10 B-
11 B
12 B+
13 A-
14 A
15 A+

If the above is in A2:b16, and the average is returned in E1
the reference is vlookup
=VLOOKUP(E1+0.25,A2:B16,2)

or subtract 0.25 from each of column A so, 0.75, 1.75 2.75 etc and
=VLOOKUP(E1,A2:B16,2)

Regards

Dav


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