The frequency distribution table shows the marks obtained by 100 students in a Mathematics test.




Marks (%)

1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100


Frequency
2
3
5
13
19
31
13
9
4
1



(a) Draw the cumulative curve for the distribution.
(b) Use the graph to find the : (i) 60th percentile ; (ii) probability that a student passed the test if the pass mark was fixed at 35%.


The frequency distribution table shows the marks obtained by 100 students in a Mathematics test.




Marks (%)

1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100


Frequency
2
3
5
13
19
31
13
9
4
1
