Let G= HW1 + HW2 + Exam1 + Exam 2
Range of G is [0,500]

Class average is 337.316 (67%) with stddev 83.7085

 400 <= G <= 500   ===>       A range
 300 <= G <= 400   ===> B+ or B range
 245 <= G <= 300   ===> C+ or C range
   0 <= G <= 245   ===>       F range


Note that intervals overlap.
Nov 2, 2024@15:15