To calculate the percentage of students who scored a B or higher, we first need to determine how many students achieved grades B, A, and any other higher grades.
From the distribution provided:
- A = 8
- B = 12
- C = 5
- D = 3
- F = 2
Now, we add up the number of students who scored a B or higher:
- A (8) + B (12) = 20 students
Next, let's find the total number of students:
- Total = A + B + C + D + F = 8 + 12 + 5 + 3 + 2 = 30 students
Now we calculate the percentage of students who scored a B or higher: \[ \text{Percentage} = \left(\frac{\text{Number of students who scored B or higher}}{\text{Total number of students}}\right) \times 100 \] \[ \text{Percentage} = \left(\frac{20}{30}\right) \times 100 = \frac{20}{30} \times 100 = \frac{2}{3} \times 100 \approx 66.7% \]
Therefore, the percentage of students who scored a B or higher on the exam is 66.7%.