How to find class interval when class mark is given

First find the difference of the class marks. Then divide the differnce by 2. And then subtracted the answer and also add it. You will get class intervals.
For example:- Class marks are given as 4,8,12.
The difference is 4. Dividing it by 2. we will get 2.
Subtract and add 2 to the class marks.i.e 4-2 and 4+2. We get class intervals as 2-6. We can do this further by the same method.
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Thanks Bhaumik Chaudari!!!
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Thanks for the answer
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Find the difference then divide it by 2 and then subtract the answer and also add it 
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Thq
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Thanks for the answer you have explained it with an example
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what will we do if we don't get a clear difference for eg if the class marks are 5 7 9 13 17
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See, I have got a better option. 1) Find difference b/w class marks and divide it by the lower class limit. 2) Find Sum of lower and upper class limit and divide it by upper class limit. 3) Add both the results obtained in (1) and (2) to get the lower limit. 4) Subtract the results obtained to get upper limit. This method is also benificial in cases when the class marks are irregular / uncontinous
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Lower class mark = 37 Upper class mark = 57 Range = 57 - 37 = 20 Let the number of classes be 4. Therefore, size of the class = 20/4 = 5. Class limits are 36 - 40, 41 - 45, 46 - 50, 51 - 55, 56 - 60.
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upper limit - lower limit
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