The following table gives the distribution of students of two sections according to the marks obtained by them: | Section A | | Section B | | |-----------|-----------|-----------|----------| | Marks | Frequency | Marks | Frequency | | 0 - 10 | 3 | 0 - 10 | 5 | | 10 - 20 | 9 | 10 - 20 | 19 | | 20 - 30 | 17 | 20 - 30 | 15 | | 30 - 40 | 12 | 30 - 40 | 10 | | 40 - 50 | 9 | 40 - 50 | 1 | Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.

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TextFrequency PolygonNCERT Textbook

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Consider the marks, out of 100, obtained by 51 students of a class in a test, given in Table 12.5. | Marks | Number of students | |-------|--------------------| | 0 - 10 | 5 | | 10 - 20 | 10 | | 20 - 30 | 4 | | 30 - 40 | 6 | | 40 - 50 | 7 | | 50 - 60 | 3 | | 60 - 70 | 2 | | 70 - 80 | 2 | | 80 - 90 | 3 | | 90 - 100 | 9 | | Total | 51 | Draw a frequency polygon corresponding to this frequency distribution table.

TextFrequency Polygon

In a city, the weekly observations made in a study on the cost of living index are given in the following table: | Cost of living index | Number of weeks | |----------------------|-----------------| | 140 - 150 | 5 | | 150 - 160 | 10 | | 160 - 170 | 20 | | 170 - 180 | 9 | | 180 - 190 | 6 | | 190 - 200 | 2 | | Total | 52 | Draw a frequency polygon for the data above (without constructing a histogram).

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