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The table shows the frequency distribution of marks scored by some candidates in an ...

The table shows the frequency distribution of 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
Freq 2 5 8 18 20 15 5 4 2 1



(a) Draw the cumulative frequency curve of the distribution.
(b) Use your graph to estimate the :
(i) semi-interquartile range of the distribution; (ii) percentage of candidates who passed with distinction if the least mark for distinction was 72.




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