Frequency Distribution of Data

Chapter 4 Class 8 Data Handling
Concept wise

Suppose 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.

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### Transcript

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