What is Frequency polygon

this presentation is about frequency polygon. in this presentation we will study about frequency polygon, its part and its types etc

1. FREQUENCY POLYGON P repared by: SAFI ULLAH B.S Botany 4 TH Semester Class Roll No: B-11

2. DEFINITION OF FREQUENCY POLYGON A frequency polygon is a graph that uses lines that connect points plotted for the frequencies at the midpoints of the classes; frequency are represented by the heights of the midpoints. OR Polygon is a form of diagrammatic presentation of data. It is formed by joining all the mid points of the tops of all rectangles. However they can be formed even without constructing a histogram.

3. DRAWING FREQUENCY POLYGON Frequency polygons can be drawn in two ways; With a Histogram. Without a Histogram.

4. Frequency polygon: With a Histogram Class limits No. of Sarees 100-200 10 200-300 27 300-400 37 400-500 24 500-600 20 600-700 15 700-800 10 The total area excluded from the histogram is Equal to the area included under frequency polygon.

5. Frequency polygon: without a Histogram Mid points Frequency 55 1 65 4 75 6 85 5 95 2

6. Construction of Frequency Polygon To construct a frequency polygon following steps are imported: Find the midpoints of each class. Draw the X-axis and Y-axis. Label the X-axis with the midpoint of each class then use a suitable scale for the frequencies on the Y-axis. Using the midpoints for the X values and the frequencies as the Y values, plot the points. Connect adjacent points with line segments. Draw a line back to X-axis at the beginning and end of the graph (where the next mid points would be located).

7. Example of constructing a Frequency Polygon Test scores Frequency Mid points 49.5---59.5 5 54.5 59.5---69.5 10 64.5 69.5---79.5 30 74.5 79.5---89.5 40 84.5 89.5---99.5 15 94.5

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9. Example No.2 Mark Class Frequency Mid points 1---5 1 3 6---10 5 8 11---15 8 13 16---20 6 18

10. References www.google.com www.slideshare.net www.Wikipedia.org

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