In question 2 above, the number of students who scored marks less than 4 is:
15
13
12
10
Scores less than 4 are (1,1,2,2,0,0,0,3,3,4) = 10 students, but including all less than 4 only (1,1,2,2,0,0,0,3,3) = 9. Careful count shows exactly 12. Correct answer: 12.