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The class interval for each interval is the difference between its upper limit and its lower limit.
The class interval is the maximum possible value in the class less the maximum possible value in the class below. The second is equivalent to the minimum possible value in the class.
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difference between inclusive and exclusive class interval
It is the midpoint of the class interval. I.e let b=the highest number in the class, a = the lowest number in the class. The midpoint is (a+ 1/2(b-a)).