 Hi and welcome to the session. Today we will learn about bar graph. A bar graph is a representation of numbers using bars of uniform width and the length of the bars depends upon the frequency and the scale we choose. As it's looking at the bar graphs we can easily find out the information regarding the data. Let's take an example for this. Here we are given the number of children in class 1, 2nd and 3rd and we need to represent the given data on the bar graph. So here we will drop the bar graph. On this axis we will take the class and on this axis we will take the number of children. Now we need to choose the scale. So let us start the scale at 0. Now the greatest value in the data is 60. So we will end this scale at a value greater than 60 say 70. So let us take 1 unit equal to 10 children. This is the scale for this bar graph. Now in class 1st there are 35 children. So between 20 and 30 over here we will have 35. Now we will make the bar for 1st class that is for 35 children. So this is the bar for 1st class. Now in 2nd class there are 60 students. So here is 60. Now we will make the bar for 2nd class. Now in 3rd class there are 45 students. So here 45 will lie between 40 and 50 over here. So this is the bar for 3rd class. And thus this is the required bar graph for the given data. Now by just looking at this bar graph we can see that there are an actual number of children in class 2nd as the bar of class 2nd is the longest one and there are minimum number of children in class 1st as the bar of class 1st is the shortest one. So this is how we can draw a bar graph for the given data and we can answer the questions related to the bar graph. Now let us move on to double bar graph. With the help of a double bar graph we can compare two collections of data at a glance. Let us consider an example for this. Here we have given the performance of a student in 1st term and 2nd term in the following subject and we need to draw a double bar graph for the given data. Let us take subject on this axis and marks on this axis. To draw the required double bar graph we will take the scale as 1 minute equal to 10 marks. Now we will start the scale at 0 and as the maximum value in the data is 45 so we will end the scale at a value higher than 45 say 50. Now the marks in 1st term in the subject English are 37. So here this bar represents the marks in English for the 1st term and the marks in English in 2nd term are 35. So let us draw the bar for the marks in English for 2nd term. So here this shaded bar represents the marks in English for the 2nd term. Here this type of bars represents the marks in 1st term and the shaded bars represents the marks in 2nd term. Now the marks in Hindi in 1st term are 42 and in 2nd term are 39. So here these bars represents the marks in Hindi for the 1st term and 2nd term. And lastly the marks in maths for the 1st term are 30 and for the 2nd term are 45. So here we have drawn the bars for maths for the 1st term and 2nd term. Thus this is the required double bar graph for the given data. Now by just looking at this double bar graph, we can see that the student has improved the most in the subject maths. Thus we can compare the performance of a student in 1st term and 2nd term using this double bar graph. Thus in this session we have learnt to draw a bar graph and a double bar graph. With this we finish this session. Hope you have understood all the concepts. Goodbye, take care and keep smiling.