The marks of 65 students on a statistics test (out of 100 marks) are measured. All of the students get a grade of 50 or above. 9 students get a grade that lies in the interval [50,60) (recall this interval counts students with grades of 50 to under 60 but does not include students who get a grade of 60). The relative frequency of students with a mark of 60 and above is

56

0.862

cannot be determined

0.138