The table below shows the frequency distribution of the marks of 800 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


Freq
10
40
80
140
170
130
100
70
40
20



(a) (i) Construct a cumulative frequency table ; (ii) Draw the Ogive ; (iii) Use your ogive to determine the 50th percentile.~(b) The candidates that scored less than 25% are to be withdrawn from the institution, while those that scored than 75% are to be awarded scholarship. Estimate the number of students that will be retained, but will not enjoy the award.



The table below shows the frequency distribution of the marks of 800 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


Freq
10
40
80
140
170
130
100
70
40
20
