8 Worksheets consisting over 90 questions related to determining class intervals of grouped data, constructing frequency tables of grouped data, determining suitable class intervals, determining modal class and mean of grouped data based on frequency tables, constructing histograms and extracting data from existing histograms, interpreting frequency polygon graphs, constructing cumulative frequency tables, constructing ogive graphs, interpreting and extracting data from ogive graphs, calculating first quartile, 3rd quartile and interquartile range. Worksheets suited for students in KS 4.