Final grade:
-60% students get B- and above.
- performance below 40% of the whole quarter--> fail.
- do bad in midterm 1, good in midterm 2 --> reward
- Calculate in excel.
- After assigning letter grade, wait one hour before releasing it.
- After releasing it to students, wait for one day before submitting it.
(11/24/2015:) 45%---> C-