It is a better way of presenting data but still it does not condense the data much.
The ungrouped frequency distribution is quite handy if
Values of the variables are largely repeated.
Variable under consideration takes only a few values.
Grouped frequency distribution
It is formed by dividing the entire range of the values of the variable into a suitable number of
Then the number of observations in each group is recorded.
The various groups in which the values of the variables are divided are known as classes or class
intervals. e.g. 1 – 3, 4 – 6 .
The two values specifying the class are called class limits:- the bigger value is upper class limit.
smaller value is the lower class limit.
e.g, 1(lower class limit) – 3 (lower class limit)
The number of values specified in a given class interval is called its length or width or magnitude.