Define the following terms:
(i) Observations
(ii) Raw data
(iii) Frequency of an observation
(iv) Frequency distribution
(v) Discrete frequency distribution
(vi) Grouped frequency distribution
(vii) Class-interval                             
(viii) Class-size
(ix) Class limits                                
(x) True class limits

Explanation

(i) Observations:-
Data obtains by the observer from the given problem is called observations.
(ii) Raw data:-
Data collected in its original form is called Raw Data.
(iii) Fequency of an observation:-
Number of times a certain value occurs is termed as frequency.
(iv) Frequency distribution:-
Organisation of Raw data in tabular form is called Frequency Distribution.
(v) Discrete frequency distribution:-
Frequency Distribution in which Raw Data is ungrouped is called Discrete frequency distribution.
(vi) Grouped frequency distribution:-
A frequency Distribution in which Raw data is grouped in specific class.
(vii) Class-interval:-
Class interval is a group under which large number of data is grouped to analyze its Range and Distribution.
(viii) Class-size:-
Class –size is defined as the difference between upper and lower boundaries of any class.
(ix) Class limits:-
Class limits works as separation of one class in a grouped frequency distribution from another.
(x) True class limits:-
The Exact class limits of frequency distribution are called True class limits.