Percentage = (Obtained Points / Total Points) * 100
Percentage = (158 / 195) * 100
Percentage ≈ 81%
Now, let's assign a letter grade based on the percentage:
A: 90% and above
B: 80% to 89%
C: 70% to 79%
D: 60% to 69%
F: Below 60%
Since the calculated percentage (81%) falls within the B range (80% to 89%), the grade for 158 out of 195 points is B.