Lesson (1.2) Part A: Introduction to Grouped data.

First what is grouped data ?

Grouped Data is when Raw Data has been classified into a frequency table.

Example of Raw Data converted into frequency table :

Example of grouped data :

There is also another kind of frequency table called Grouped Class Interval Data :

We need to learn how to find mean, mode and median of grouped data before we learn how to find Standard Deviation of grouped data.

He is how we calculate mean, mode and median of grouped data :

To learn how to find Standard Deviation of grouped data, we shall learn from Part(B) in the next lesson.