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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The class interval for each interval is the difference between its upper limit and its lower limit.
90
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)).
Yes.