Below is the correspondance between the number grade on your midterm and a letter grade. Remember, your final grade is computed by averaging the raw percentages on each of your midterms with the raw percentage on your homework. Thus, the below letter grade has no direct influence over your final grade. It can be interpreted as the letter grade you would get for the course if the only grade came from the first midterm. The below scores are out of 70.

A ≥ 64
AB ≥ 60
B ≥ 54
BC ≥ 50
C ≥ 44
D ≥ 35
F otherwise

Average score: 56.34