Question

Construct a frequency polygon that represents the following data regarding the selling prices of houses sold in 2006 for a particular neighborhood.

Prices of Houses

Class	Frequency
298183–338182	6
338183–378182	8
378183–418182	7
418183–458182	9
458183–498182	3

Step 3 of 5:

Find the value that should be written at the location indicated by the [?] on the vertical axis of the graph.

Step 4. Find the value that should be written at the location indicated by the [?] on the horizontal axis of the graph.

Step 5. Plot the data values for each of the classes in the frequency polygon.

Answer 1

The following is the table alongwith some other values -

Classes	Class Boundaries	Mid-Point of each class	Frequency
298183-338182	298182.5-338182.5	318182.5	6
338183-378182	338182.5-378182.5	358182.5	8
378183-418182	378182.5-418182.5	398182.5	7
418183-458182	418182.5-458182.5	438182.5	9
458183-498182	458182.5-498182.5	478482.5	3

Mid - Point of each class is obtained by the formula [(Upper limit + Lower Limit) of each class / 2].

The Corresponding Class Boundaries are also obtained

STEP 3

On the vertical axis of the graph, the frequency of the corresponding class must be written

STEP 4

On the horizontal axis of the graph, the Class Intervals / Class Boundaries must be written

STEP 5

The Frequency Polygon of the given data is given below -

To each mid point of the class intervals the corresponding frequency value is plotted.