Concept:Students who scored less than the pass mark of 5 are considered to have failed the test.Explanation:From the bar chart, the frequencies of students who scored 0,1,2,3, and 4 represent those who failed.Number of students who failed:5+6+4+3+2=20Total number of students who took the test:5+6+4+3+2+4+6+5+1+3+1=40Percentage of students who failed:4020×100%=50%Therefore, half of the class failed the test.Answer:50%The correct option is C.
