Draw a histogram for the following data:

Class interval	Frequency
600 - 640	18
640 - 680	45
680 - 720	153
720 - 760	288
760 - 800	171
800 - 840	63

Using this histogram, draw the frequency polygon on the same graph.

Frequency distribution table :

Steps of construction of histogram:

1. Since, the scale on x-axis starts at 560, a break (kink) is shown near the origin on x-axis to indicate that the graph is drawn to scale beginning at 560.

2. Take 1 cm along x-axis = 40 units.

3. Take 1 cm along y-axis = 50 units.

4. Construct rectangles corresponding to the above continuous frequency distribution table.

Steps of construction of frequency polygon:

1. Mark the mid-points of upper bases of rectangles of the histogram.

2. Join the consecutive mid-points by line-segments.

3. Join first end point with mid-point of class (560 - 600) with zero frequency, and join the other end point with the mid point of class (840 - 880) with zero frequency.

The required frequency polygon is shown by thick line segments in the diagram.