The frequency table shows the marks scored by 32 students in a test.

Marks scored	1	2	3	4	5	6	7	8	9	10
No of students	2	3	4	4	4	4	5	3	2	1

Find the :

(a)(i) mean ; (ii) median ; (iii) mode of the marks;

(b) percentage of the students who scored at least 8 marks.