It is calculated by adding the upper and lower limits/boundaries and dividing by two.
But in starting i.e. if you are drawing tables then it is written like for e.g. 0-10 then at starting we should write on 10 and then continue as written above.
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25-30 in a class in statistics
class frequency
90
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)).
Class width, from statistics, is the difference between the two boundaries of a class. A class is an interval that includes all of the values in a (quantitative) data set that fall within two numbers, the lower and upper limits of the class. Finally, a class boundary is the midpoint of the upper limit of one class and the lower limit of the next class.