Question

what do you mean by class limit define it

Answer 1

Class interval refers to the numerical width of any class in a particular distribution. ... In statistics, the data is arranged into different classes and the width of such class is called class interval. 
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Answer 2

Class limits are end numbers of a class interval. For instance, we have a class interval 1−5 . 1 is called the lower limit (LL) and 5 is the upper limit (UL). These numbers define a class.