Grouped Frequency Distribution TableSuppose we have data like
Marks of 20 students in a Math’s test
11, 4, 27, 18, 18, 3, 24, 22, 11, 22, 18, 11 , 18, 7, 29, 18, 11, 6, 29, 11
Here, marks range from 3 to 29
In grouped frequency distribution table,
we take groups like 0-5, 5-10, 10-15, ………, 25-30
& find frequency in that group.
11, 4, 27, 18, 18, 3, 24, 22, 11, 22, 18, 11 , 18, 7, 29, 18, 11, 6, 29, 11
Here,
0-5, 5-10, 10-15, ….. are class Intervals
11, 4, 27, 18, 18, 3, 24, 22, 11, 22, 18, 11 , 18, 7, 29, 18, 11, 6, 29, 11
Here,
0-5, 5-10, 10-15, ….. are class Intervals
Age of 30 people in your locality is
5, 65, 62, 48, 5, 23, 17, 40, 30, 30, 30, 51, 5, 17, 17, 39, 23, 48, 40, 65, 65, 62, 5, 5, 17, 62, 51, 23, 48, 40
Here age ranges from 5 to 62
In grouped frequency distribution table,
we take groups like 0 – 10, 10 - 20, 20 – 30, … …, 60 – 70
& find frequency in that group
5, 65, 62, 48, 5, 23, 17, 40, 30, 30, 30, 51, 5, 17, 17, 39, 23, 48, 40, 65, 65, 62, 5, 5, 17, 62, 51, 23, 48, 40
Here,
Width of class interval = 10 − 0 = 10

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.