#### The following table shows the cumulative frequency distribution of marks of 800 students in an examination:                Marks Number of students Below 10 Below 20 Below 30 Below 40 Below 50 Below 60 Below 70 Below 80 Below 90 Below 100 10 50 130 270 440 570 670 740 780 800 Construct a frequency distribution table for the data above. Solution.    Frequency distribution: It tells how frequencies are distributed over values in a
frequency distribution. However mostly we use frequency distribution to summarize categorical variables.

 Marks cf f 0-10 10 10 10-20 50 50-10=40 20-30 130 130-50=80 30-40 270 270-130=140 40-50 440 440-270=170 50-60 570 570-440=130 60-70 670 670-570=100 70-80 740 740-670=70 80-90 780 780-740=40 90-100 800 800-780=20
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