
Frequency Polygons can be drawn independently without drawing the histograms. In drawing a histogram of a given frequency distribution, we take the following steps: Step 1. : If the frequency table is in the inclusive form, we first convert it into an exclusive form and make it a continuous interval. Step 2. :To complete the polygon we assume a class interval with zero frequency preceding the first class interval and a class interval with zero frequency succeeding the last class interval. Step 3. : Taking a suitable scale, we represent class marks along x axis. Step 4. : Taking a suitable scale, we represent frequency along y axis. Step 5. : We plot the corresponding points and join it with the help of line segment. Consider the following example. In a city, the following weekly observations were made in a study on cost of living index : Following is the frequency polygon for the above data Directions: On the basis of the given information answer the following questions 