Interpretation of a Bar Graph

Look at the bar graph, we can easily answer the related question quite easily.

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 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 Vickey production is given below. Draw the bar graph to represent the data.

DaysMondayTuesdayWednesdayThursdayFridaySaturday
Number of Phones Sold251332144255

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 number of phones on the vertical line.
  • Take a suitable scale for the number of phones and mark on the vertical line. Let 1 unit is equal to 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 phone in Vicky Production.

This same bar graph can be made by interchanging the production of the days and the number of phones

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