Gradebook

The present gradebook is good and worksfine. However, in our department we have the following procedure to evaluate the grade.

Examinations:
1. Each teacher conducts 3 sessional tests for 40 marks each
2. Each teacher gives quiz/assignments for 10 marks
3. End semester examination will be for 50 marks

For Grading Purposes:
1. For 40 marks: Teacher calculates either takes average of the three sessional marks or average of best two of three sessional tests
2. For 10 marks: Takes from quz/assignments
3. For 50 marks: End semester examination

Grading process:
1. Every student is awarded marks for a total of 100 marks (40+10+50).
2. The class average is taken
3. The standard deviation is taken
4. The class average is awarded C grade on a 7 point scale (S, A, B, C, D, E, F)
5. According the standard deviation other grades above or below are awarded (of course at times with slight subjectivity)

Since moodle gradebook doesnot have these facilities our teachers simply upload the absolute marks alone. Is it possible to do these things in the present gradebook?