Mr. Kapoor compares the prices (in ₹) of different items at two different shops A and B. Examine the following table carefully and represent the data by a double bar graph.

The following table shows the modes of transport used by boys and girls for going to the same school.

Draw a double bar graph representing the above data.

The difference between the greatest and the smallest values of observations is called :

1. frequency

2. range

3. class-mark

4. class-limit

The difference between the upper and lower class-limits of a class-interval is called :

1. width of the class-interval

2. frequency

3. class-limit

4. class-mark