Explain the meaning of the following terms :
(i) variate
(ii) class size
(iii) class mark
(iv) class limits
(v) true class limits
(vi) frequency of a class
(vii) cumulative frequency of a class.
Solution:
(i) Variant: A particular value of a variable is called variate.
(ii) Class size: The difference between the actual upper limit and the actual lower limit of a class is called its class size.
(iii) Class mark: The class mark of a class is the value midway between its actual lower limit and actual upper limit.
(iv) Class limits: In the frequency table the class interval is called class limits.
(v) True class limits: In a continuous distribution, the class limits are called true or actual class limits.
(vi) Frequency of a class: The number of tally marks opposite to a variate is its frequency and it is written in the next column opposite to tally marks of the variate.
(vii) Cumulative frequency of a class: The sum of frequency of all previous classes and that particular class is called the cumulative frequency of the class.
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