Scores below are on a 100-point scale.  Let

F = final exam score
X = average of mid-semester exam scores
H = average of best 80% of homework set scores

Then your course score S is the weighted average defined, in Mathematica notation, by:

S = Apply[Plus,{0.25,0.50,0.25}* {F,X,H}]

Course scores 86–100 earn a course grade of A; 76–85 at least B; 60–75 at least C; 50–59 at least D.  Intermediate scores may earn course grades of A-, B+, etc.

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