Discrete and continuous data
There are two different kinds of data: discrete and continuous. Different diagrams are used depending on the data type.
Whole number data that is counted, not measured
The number of books on each shelf in a library
Measurable data that could take any value
The height of students in class
Deciding the type of numerical data you have allows you to decide which chart, graph or diagram to use.
The heights of students in a class.
Discrete data is whole number data that is counted, not measured.