Question

For student's activity of pasting a printout of a frequency polygon :​

Answer 1

Step-by-step explanation:

Constructing Frequency Polygon Using Histogram - Steps

Step 1 :

Obtain the frequency distribution from the given data and draw a histogram.

Step 2 :

Join the mid points of the tops of adjacent rectangles of the histogram by means of line segments.

Step 3 :

Obtain the mid points of two assumed class intervals of zero frequency, one adjacent to the first bar on its left and another adjacent to the last bar on its right.

These class intervals are known as imagined class interval.

Step 4 :

Complete the polygon by joining the mid points of first and the last class intervals to the mid point of the imagined class intervals adjacent to them.

Answer 2

Step-by-step explanation:

Draw a frequency polygon imposed on the histogram for the following distribution.



Solution :

Take the class-intervals along the X-axis and frequencies along the Y-axis with appropriate scale as shown in the figure given below.

Draw a histogram for the given data.

Now mark the mid points of the upper sides of the consecutive rectangles.

We also mark the midpoints of the assumed class intervals 0-10 and 90-100.

The mid points are joined with the help of a ruler.

The ends of the polygon are joined with the mid points of 0-10 and 90-100. Now, we get the frequency polygon.