The table shows the marks scored by some candidates in an examination.



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


Frequency
7
11
17
20
29
34
30
25
21
6



(a) Construct a cumulative frequency table for the distribution and draw a cumulative frequency curve.~(b) Use the curve to estimate, correct to one decimal place, the :
(i) Lowest mark for distinction if 5% of the candidates passed with distinction ; (ii) probability of selecting a candidate who scored at most 45%.


The table shows the marks scored by some candidates in an examination.



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


Frequency
7
11
17
20
29
34
30
25
21
6
