Question

The following table shows the cumulative frequency distribution of marks of 800 students in an examination:

Marks	Number of students
Below 10	10
Below 20	50
Below 30	130
Below 40	270
Below 50	440
Below 60	570
Below 70	670
Below 80	740
Below 90	780
Below 100	800

Construct a frequency distribution table for the data above.

Answer 1

Marks	Number of students	C.I.	No. of students
Below 10	10	0 – 10	10
Below 20	50	10 – 20	50 – 10 = 40
Below 30	130	20 – 30	130 – 50 = 80
Below 40	270	30 – 40	270 – 130 = 140
Below 50	440	40 – 50	440 – 270 = 170
Below 60	570	50 – 60	570 – 440 = 130
Below 70	670	60 – 70	670 – 570 = 100
Below 80	740	70 – 80	740 – 670 = 70
Below 90	780	80 – 90	780 – 740 = 40
Below 100	800	90 – 100	800 – 780 = 20