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## ICSE Grade IX Maths Demo Videos

The next sum on histogram we will see is this one draw the histogram to represent the following data and the data is given like this two rows are There the first row daily sales of a store in rupees 0 to 1000, 1000 to 2000, 2000 to 3000 and so on in the second row number of days in a month 2,10,12 and  so on right now the question is where to draw a histogram for this data right if you see the classes the classes are continuous so our first step the classes should be continues  that is done for us right so the first column daily sales of a store in rupees the second column the frequency that is number of days in a month the classes will write them one below the other ok as it is given to us in the sum and the second column frequency also will write one below the other as it is given to us in that prop write this last row total it is not required you just require the classes and you require the frequency to draw the histogram then we’ll take up the graph paper and then we’ll prepare the x-axis and y-axis and will write X dash y dash intersecting at 0 then we are going to put the class limits on the x axis right class limits what are the classes in the sum daily sales of a store in rupees will like That ok and on the y-axis we are going to write the frequencies right so what is the frequency in this some it is number of days in a month so that is write that On Y axis  number of days in a month the x-axis and y-axis we are written let us put the class limits on the x axis right now other classes starting from zero yes they are starting from zero can you see that 0 to 1000 is the first class so 0 is there on the x axis that is at the origin can you see that 0 at the origin from that zero only  start 0 to 1000 and so on correct so 0 to 1000 will be the first class than 1000 to 2000, 2000 or 3000 we are leaving a gap of 2-2 centimeters and then putting all the limits we can leave a gap of one centimeter also the choices ours but we are leaving a gap of 2-2 centimeters so 0 to 1000 1000 to 2000 and so on

2000 to 3000, 3000 to 4000 and then 4,000 to 5,000 that the last one right then X axis we have put all the numbers then check the difference between 0 and the first limit and then the difference between the first limit and the second limit let’s check  the difference what’s the difference between zero and one thousand the difference between zero and one thousand is 1000 correct check the next difference what’s the difference between 1000 and 2000 the difference is 1000 is a different same or not .yes it is same the difference is that same and whenever the differences are same we don’t put anything mark right since the differences are same we will not put the krink mark when do we put krink mark when the difference are not same here they are same so no krink mark the x-axis is fully ready let’s put the numbers on the y axis or the highest frequency if you see the frequency column for the highest frequency the highest frequencies to 12 and since the highest frequencies 12 and since we have 20 centimeters with us we can go for the easiest scale easiest and simplest scale which is one centimeter is equal to 1 unit on the y-axis so if this is a scale then how is our y-axis is going to progress 1 2 3 4 5 6 7 8 9 10 11 and 12 it right so we have put the numbers on the x-axis y-axis everything so graph paper is ready no one more thing is there which is that scale so let’s write the scale on the top right hand side corner we write the scale on the x-axis and scale on the y-axis on x axis what  the scale, scale on any axis is nothing but gap is equal to the difference now gap take any two numbers on the x-axis 1000-2000 what are the gap we left within the two the gap we left these two centimeters and what’s the difference the difference is 1000 so two centimeters is equal to rupees 1000 is a scale the x-axis and the y-axis what is the scale any two numbers you take gap is equal to the difference gap we left is one centimeter difference is also one units or scale on the y-axis is one centimeter is going to one unit but what is the unit on the y-axis is number of days so it’s 1 centimeter is equal to one day right so graph paper is fully ready to draw the histogram how do we draw for each class you have to draw a rectangle up to the frequency the first class the frequency is 2 so you have to draw a rectangle up two what is the first class 0 to 1000 so 0 to 1000 the frequency is too many office Leave a 1  . some of us start with 1000 know what are the lower limit of the first class 0 so  start from zero here start from zero. zero to 1,000 right so that will be a rectangle the first rectangle to second rectangle the frequencies up to 12 so we have to draw a rectangle up to 12 third class of frequencies 10 so draw a rectangle upto 10 forth class the frequency is 4 you how to draw a rectangle up to fourth the fifth class of frequencies 2 so we have to draw a rectangle up 2 this way we are completed the histogram thank you.

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2017-04-18T04:56:39+00:00 Categories: ICSE-IX|Tags: |0 Comments
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