2021 · Q2
The following table shows the marks of 90 students in a test of 80 marks:
Marks: 1–10 → 5 students
Marks: 11–20 → 8 students
Marks: 21–30 → 10 students
Marks: 31–40 → 13 students
Marks: 41–50 → 18 students
Marks: 51–60 → 17 students
Marks: 61–70 → 12 students
Marks: 71–80 → 7 students
The percentage of students who have obtained less than or equal to 50% marks is
Elementary MathematicsStatistics
- A30%
- B40%
- C45%
- D60%
Explanation
50% of the 80-mark test is 40 marks. Students scoring at most 40 are those in classes 1–10 through 31–40: 5 + 8 + 10 + 13 = 36 students. 36 out of 90 is 40%. Hence option B.