The table below shows the frequency distribution of the marks scored by fifty students in an examination.



Marks (%)
0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
80-89
90-99


Freq
2
3
4
6
13
10
5
3
2
2



(a) Draw the cumulative frequency curve for the distribution.~(b) Use your curve to estimate the : (i) upper quartile; (ii) pass mark if 60% of the students passed.



The table below shows the frequency distribution of the marks scored by fifty students in an examination.



Marks (%)
0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
80-89
90-99


Freq
2
3
4
6
13
10
5
3
2
2
