Now we are going to discuss about the construction of bar charts or column charts. Let us briefly remind you What is a bar graph?
Bar charts are the easiest way to present data.
● In consists of rectangular bars of the same width.
● The distance between the two consecutive bars must be the same.
● Bars can be marked both vertically and horizontally. We usually use vertical bars.
● The height of the bar corresponds to the frequency of the corresponding bar Monitoring.
For example, Let’s consider the following data of the bar graph.
The following data provides information about the number of children involved in different activities.
|Number of Children||30th||40||25th||20th||53|
How do I create a bar chart?
Occurs Creation of bar charts / column charts:
● On a diagram, draw two lines perpendicular to each other that intersect at 0.
● The horizontal line is the x-axis and the vertical line is the y-axis.
● Along the horizontal axis, choose the uniform width of the bars and uniformity gap between the bars and write the names of the data elements whose values are to be marked.
● Choose an appropriate scale along the vertical axis to determine the Heights of the bars for the specified values. (The frequency is measured along the y-axis.)
● Calculate the height of the bars using the selected scale and Draw the Bars.
The bar graph provides information on the number of children involved in different activities.
Solved examples Creation of bar charts:
1. The percentage of total income that a family spends under different heads is given below.
|Different heads||eat||dress||health||education||House rent||miscellaneous|
|% Total age
Present the above data in the form of a bar chart.
2. 150 grade VI students have popular school subjects as follows:
|Number of students||30th||20th||26||38||34|
Draw the column chart / bar graph showing the above data.
Take the subjects with you X axisand the number of students y-axis
The bar chart provides information on 150 students’ favorite subjects.
3. The number of students in 5 different classes in a school is given below. Read the data and present it on a bar graph.
Let’s draw a bar graph to represent the information given.
(i) Draw a horizontal axis and mark the points on the line to indicate Class I, Class II, Class III, Class IV, Class V at appropriate intervals.
(ii) Draw a vertical axis and choose the square 1 = 25 students to mark the points that represent the number of students.
(iii) Draw bars of equal thickness for each class, keeping the distance between bars the same.
(iv) Give the title as the number of students in 5 different classes in a school.
4th Vehicle traffic at a busy intersection at a given location was recorded from 6 a.m. to 2 p.m. on a given day and the data rounded down to the nearest ten.
|Time in hours||6 – 7||7 – 8||8 – 9||9-10||10-11||11-12||12 – 1||1 – 2|
|Number of vehicles||100||450||1250||1050||750||600||550||200|
The bar chart provides information about the number of vehicles that pass the intersection in different time intervals.
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