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...

The table below shows the frequency distribution of the marks of 800 candidates in an examination.

(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(b) The candidates that scored less than 25% are to be withdrawn from the institution, while those that scored than 75% are to be awarded scholarship.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.