Bar Graph

Bar Graph

As the pictograph is a very time-consuming process, so we can use another way to represent data.

If we use the bars of the same width with equal spacing to represent the data in which the length of the bars represents the frequency is called Bar Graph or Bar Diagram.

Interpretation of a Bar Graph

Example

The following graph tells the favourite colours in a class of 30 students.

Answer the following questions:

  • Which colour is liked by the maximum number of students?
  • Which colour is liked by the same number of students?

Solution

  • The graph shows that the pink colour is liked by 9 students so it is the favourite colour of the maximum number of students.
  • Blue and green colour bars are equal in length and both are liked by 6 students.

Drawing a Bar Graph

Drawing a bar graph is an interesting task, but we must choose an appropriate scale to draw the bar graph. It depends upon our own choice that what we are taking for the scale.

Example

The daily sale of mobile phones in Vicky production is given below. Draw the bar graph to represent the data.

Solution

Steps to make a bar graph-

  • Draw two lines, one horizontal and one vertical in L shape.
  • Mark days on the horizontal line and no. of phones on the vertical line.
  • Take a suitable scale for the number of phones and mark on the vertical line. Let 1 unit = 10 phones.
  • Use the bars of equal width and draw them with the frequency given at the same distance.

The height of the bars tells the sale of the mobile phones in Vicky production.

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