Frequency Distribution

Frequency Distribution: A frequency table is used to summarize categorical, nominal, and ordinal data. It may also be used to summarize continuous data when the data set has been divided  into meaningful groups.

Count the number of observations that fall into each category. The number associated with each category is called the frequency and the collection of frequencies over all categories gives the frequency distribution of that variable.

Table 1 Frequency Distribution of Time

Time	Count
110	1
115	2
120	4
125	3
130	5
135	3
140	4
145	2
150	1

The relative frequency is a number which describes the proportion of observations falling in a given category. Instead of counts, we report relative frequencies or percentages.