Mathematics
Define the following terms:
(i) Variable
(ii) Class-interval
(iii) Class-size
(iv) Class-mark
(v) Class-limits
(vi) True class-limits
(Vii) Frequency of a class
(viii) Cumulative frequency of a class
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Answer
(i) Variable : A quantity which can take different values is called a variable.
(ii) Class-interval : A range of values into which data is grouped in a frequency distribution.
(iii) Class-size : It is the difference between the true upper limit and the true lower limit of class.
(iv) Class-mark : It is the midpoint( middle value) of a class-interval.
(v) Class-limits : These are the smallest and largest values of the class interval.
(vi) True class-limits : These are the actual limits of a class interval after removing the gap between two consecutive classes.
(vii) Frequency of a class : It is the number of observations that fall within that class-interval.
(viii) Cumulative frequency of a class : It is the sum of the frequencies of all the previous classes and that particular class.
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