Percentages are used internally by the GradeBook program when computing grades. The assignment grade is first converted to a percentage (the number correct divided by the total number and then multiplied by 100). Then the method of computing the category and subject grade are applied. You may choose one of the following methods to compute grades:
Let:
M==Assignment mark (grade)
W==Assignment weight
V==Assignment total value
N==Number of assignments
Straight Average = sum(M) / sum(V)
Even Average = sum(M/V) / N
Weighted Average = sum(M/V*W) / sum(W)
Equal Value = sum(M/V) / N
Assignment Average = sum(M) / sum(V)
With the "straight", "even", or "weighted average" method it is VERY important to realize that assignment grades are used to calculate category grades and THEN category grades (not assignments) are used to compute the subject grade.
The "equal value" and "assignment average" methods use all assignments to compute the subject grade.
Excused assignments and no credit assignments are not included in the category calculation. Missed assignments are given a value of 45% of the assignment's worth. Extra credit assignments (negative weights) are included but are not used in computing the averages.
After the percentage grades are computed, they are mapped to letter grades.
The grade-to-percentage and percentage-to-grade mapping may be changed by selecting 'Percentages' from the Edit menu.
