The following table shows the classification of percentages of marks of students and the number of students. Draw a frequency polygon from the table.

Result (Percentage) 30 - 40 40 - 50 50 - 60 60 -70 70 - 80 80 - 90 90 - 100

No. of students 7 33 45 65 47 18 5

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Solution

Consider the following table

Class
(Result in %) Class Mark Frequency
(Number of students)

30 - 40 35 7

40 - 50 45 33

50 - 60 55 45

60 - 70 65 65

70 - 80 75 47

80 - 90 85 18

90 - 100 95 5

The frequency polygon using the class mark and frequancy given in the above table as

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Similar questions

Marks	10−20	20−30	30−40	40−50	50−60	60−70	70−80	80−90
No. of students	7	13	20	25	10	8	6	1

Marks	10−20	20−30	30−40	40−50	50−60	60−70	70−80	80−90	90−100
Number of Students	4	10	16	22	20	18	8	2	5

Following table shows the marks of 120 students at an examination. Draw an ogive for the table: estimate Inter-quartile range.

A maths aptitude test of 50 students was recorded as follows. Calculate the mode by drawing a histogram.

Mark	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90
No. of students	8	10	15	25	20	18	9	5

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Result (Percentage)	30 - 40	40 - 50	50 - 60	60 -70	70 - 80	80 - 90	90 - 100
No. of students	7	33	45	65	47	18	5

Class (Result in %)	Class Mark	Frequency (Number of students)
30 - 40	35	7
40 - 50	45	33
50 - 60	55	45
60 - 70	65	65
70 - 80	75	47
80 - 90	85	18
90 - 100	95	5