**Introduction to learning bar and line graphs **

**WHAT IS A GRAPH:**

It is the graphical representation of any data, The graphical representation means the Y AXIS and the X AXIS are drawn. Then the Data are shown along the Y axis and the X axis as required.

Please express your views of this topic Creating a Line Graph by commenting on blog .

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Y AXIS |

X AXIS |

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**All graphs follow the same format. BUT there are different ways of showing the data.**

**We will discuss about two of them here. They are Bar graph and Line graph.**

**BAR GRAPH:**

Itis the simplest way of representing the numerical data. In BAR GRAPH weshow the data by the height of rectangular bars of equal width.

Lets learn to plot bar graphs

The number of children from grade 1 to grade 5 is given below:

Grades | Grade 1 | Grade 2 | Grade 3 | Grade 4 | Grade 5 |

Number of Children | 20 | 40 | 60 | 70 | 80 |

The Bar Graph should be done and labeled as below:

**LINE GRAPH:**

Another Graph that can represent the data in a different way is Line Graph.

A Line Graph represents the data in the form of a line. How? Let us learn to plot line graphs .

So the difference between the two graphs or graphs are clearly visible.

Now one might get confused which graph to use when. Let me clear the confusion.

**LEARN WHEN TO USE BAR GRAPHS?**

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Bar Graph is used for representing discreet or discontinuous data. Examples are like speed of different vehicles, marks of diffrent children, different countries showing the production of a particular food etc. So comparison of different things can be compared with the help of a Bar Graph. The Bar Graph shown above is an appropriate example.

**LEARN WHEN TO USE LINE GRAPHS?**

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Whenwe need to show smaller changes in Data , to show the continuous changeand also to show the changes in the data over a particilar time, we need the Line graph. Examples are like showing the height of a child over a particular time, showing the rainfall, showing the population of acountry. So any thing related to a particular object is compared. Here the successive data needs to be analyzed and compared from its precedentdata. The Line Graph shown above is just to show how the plotting of the graph is different from that of the Bar Graph.

Let me show you an appropriate Example of Line Graph.

Between, if you have problem on these topics The Box and Whisker Plot , please browse expert math related websites for more help on cbse class 11 books .

Example: The marks in maths in different grades of a particular child named Lisa is mentioned below:

Grades | Grade 1 | Grade 2 | Grade 3 | Grade 4 | Grade 5 |

Maths marks (out of 50) | 49 | 50 | 41 | 37 | 45 |

Seethe graph above. From the graph easily that from grade 1 to grade 2 hermarks were more or less constant. But her marks dipped in grade 4. It improved anyway in grade 5. At a glance you can make out the comparison.Whereas in data tabulated you had to see the individual marks for drawing an inference on her performance.

Hopethe definition and the difference of these graphs would be clear now. You can practice graphng in Excel sheet and see the difference. Keep thegraph same and just go on changing the data part and the graph type and analyze the results.