Explain the meaning of the following terms: variate         (ii)  class-integral       (iii) class-size class-mark               (v)      frequency     class limites             (vii)    true class limits

Explanation

(i) Any character which is capable of taking several different values is called a variate.
(ii) Each group into which the raw data is condensed, is called a class interval.
(iii) The difference between the true upper limit and the true lower limit of a class is called its class size.
(iv) The average of upper limit and lower limit of class interval is called as a class mark.
(v) Each class is bounded by two figures, which are called class limits.
(vi) In the exclusive form, the upper and lower limits of a class are respectively known as the true upper limit and true lower limit.
(vii) The number of times an observation occurs in a class is called the frequency.
(viii) The cumulative frequency corresponding to a class is the sum of all frequencies up to and including that class.