How can we select the stundebt and the obtained marks in bar graph should be in varticallly or horizantally ?
Answers
A bar graph is a representation of numbers using bars of uniform width and the lengths of the bars depend upon the frequency and the scale you have chosen.
It is a method of representing data visually. In the case of bar graph or bar diagram, Bars of uniform width are drawn horizontally or vertically with equal spacing between them and then the length of each bar represents the given number.
Drawing a Bar Graph
To draw a bar graph, first of all draw a horizontal line and a vertical line.
On the horizontal line we will write the name of students and on vertical line we will write numerals which show what data is being represented.
Same data can also be represented by interchanging the items on horizontal and vertical axis.
It is important to take bars of same width keeping uniform gap between them. Next, a scale is chosen if needed.
The scale varies according to the data given. One block is equivalent to ten units.
Example: Let there be 4 students A,B,C and D. The total marks Maths test is 40.Simple and double bar graphs can be obtained as:
First of all draw a horizontal line and a vertical line.
On the horizontal line we will write the names of students and on vertical line we will write scores of maths.
The scale taken is 1 unit = 5 marks.
In simple bar graph only the score of one subject is marked.
Same data can also be represented by interchanging the items on horizontal and vertical axis.
The height of the bar represents the score of a student.
Simple Bar Graph (Only maths scores)
Double Bar Graph
A simple bar graph represents one set of data. For e.g score of students in a Maths.
A bar graph is drawn in a similar way to simple bar graph.
A double graph represents two sets of data in one graph.For eg score of students in Maths and Hindi.
Example : Let there be 4 students A,B,C and D. The total marks for both hindi and Maths test is 40.Simple and double bar graphs can be obtained as:
First of all draw a horizontal line and a vertical line.
On the horizontal line we will write the names of students and on vertical line we will write scores of maths and hindi.
The scale taken is 1 unit = 5 marks.
In a double bar graph both scores of both hindi and maths is marked. For e.g where Student is marked on Horizontal axis, two bars are drawn representing the bars of hindi and maths respectively. This is done for all the students.
Same data can also be represented by interchanging the items on horizontal and vertical axis.
The height of the bar represents the score of a student.
Double Bar Graph( Both hindi and maths score)
Problem: Read the bar graph and answer the questions that follow:
Number of books sold by a bookstore during five consecutive years.
About how many books were sold in 1989? 1990? 1992?
The number of books sold in an year is depicted by the height of the bar. So, 175 books were sold in 1989. 475 books were sold in 1990.225books were sold in 1992.
In which year were about 475 books sold? About 225 books sold?
475 books were sold in the year 1990. 225books were sold in 1992.
In which years were fewer than 250 books sold?
The year with less than 250 books will have a shorter bar than the bar for the year 1992. Thus, 1989 is the year in which less than 250 books were sold.
Can you explain how you would estimate the number of books sold in 1989?
The height of the bar for the year 1989 is between 100 and 200. Between 100 and 200 there are ten units. The height is in the middle of 150 and 200.So, 175 books were sold in 1989.
Problem: The performance of students in 1st Term and 2nd Term is given. Draw a double bar graph choosing appropriate scale and answer the following:
Firstly, we take the subjects on horizontal axis and marks on the y axis.
The scale taken is 1unit = 10 marks.
The height of the bar represents the marks in a given test.
We get a double bar graph in which dark color represents term 1 and light color represents term 2.
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Answer:
bar graph chahiye