In a bar graph, there are usually rectangular bars which explain value of observation and its frequency. Height/length of the bar states frequency of observation drawn. Bar graph explains data which is presented in frequency table.
Draw bar graph from data in the following frequency table.
Observation values are placed on x axis, and their frequencies are placed on y axis. To each observation values, we draw a bar with its height equals to its frequency. The following is the bar graph that be intended.
The following table presents the result of survey done by a Survey-Company about figures who are considered as superior to be director of a public company. Draw the bar graph of the following data.
On bar graph, figures are placed on x axis, and the number of people who chose that figure (frequency) are placed on y axis. The graph is shown below.
In bar graphs, only the length of the bars are taken into consideration. To draw a bar graph, we first mark equal lengths for the different classes on the axis, i.e., x-axis.
On each of these lengths on the horizontal axis, we erect (vertical) a rectangle whose heights is proportional to the frequency of the class.
Data can be represented with a frequency table or with a bar graph. Each bar represents a group of data and the bars can be compared to each other. Bar graphs must be labelled on one axis and show the numbering on the other axis.
In a Geography class, 23 learners completed a test out of 10 marks. Here is a list of their results:
4; 1; 2; 2; 6; 9; 6; 10; 6; 8; 9; 6; 7; 7; 8; 4; 6; 6; 5; 7; 9; 10; 6.
We can use a frequency table to record this data.
We can also make a bar graph to show this data. Use the marks from 1 to 10 on the horizontal axis. Use the number of learners who got that score on the Vertical axis. The number of learners is the frequency.
Intruction: Choose the one correct answer for each question.
Use the data of the following graph to answer question 1-3.
Andi recorded the number of siblings from his classmates. The results that his obtained is presented in the following graph.
Asume x-axis serves the number of sibling(s) and y-axis serves the number of Andy’s classmates who have got the respective sibling(s).
1. The number of students who have 3 siblings is ….
A. 1 B. 2 C. 3 D. 4 E. 5
2. Most of Andy’s classmates have … siblings.
A. 0 B. 1 C. 3 D. 4 E. 5
3. The number of Andy’s classmates is …
A. 33 B. 34 C. 35 D. 36 E. 37
Key: C, solution:
Use the data of following graph to answer question 4-6.
The examination results of two different classes are presented in following graph.
Assume x-axis serves respective scores and y-axis serves the number of students who have got the respective scores.
4. The number of students in class B who get 8 is ….
A. 0 B. 1 C. 2 D. 3 E. 4
5. The number of students in class A and B is ….
A. 45 B. 46 C. 47 D. 48 E. 49
Key: C, solution:
6. Students in class B mostly get ….
A. 4 B. 5 C. 6 D. 7 E. 8
Students in class B mostly get score 7, there are six students written in y-axis.
Instruction: Solve the following problem correctly.
7. Data in the following frequency table are the weekly wages of 50 employees in a company.
Draw the bar graph of this data.