The table gives the distribution of marks of 60 candidates in a test
(a) Draw a cumulative frequency curve for the distribution.
(b) From your curve, estimate the
(i) 80th percentile;
(ii) Median;
(iii) semi-interquartile range.
The report stated that of all the questions in Part II of the paper, this was the most
popular and they performed well in it. Constructing the cumulative frequency
table, drawing the curve and reading from the curve was well handled by majority
of the candidates
