Concept:"At least 3 marks" means scores of 3 or more.Add all student frequencies for those score groups.Explanation:From the bar chart, read the number of students for the score groups from 3 marks upward.The frequencies are 9, 1, 12, 7, 5 and 10.Total students with at least 3 marks:9+1+12+7+5+10=44.Thus, 44 students scored at least 3 marks.Answer:A. 44
