# How do I calculate the lower class boundary and the upper class boundary for the class 40 - 59?

##### 1 Answer

Jan 29, 2015

It depends whether your variable is **discrete** or **continuous** .

A **discrete** variable can only have certain values, whole numbers in your case. Think of number of students in a certain course.

If this is the case the class goes from 40 to 59, and the class midpoint will be 49.5

A **continuous** variable can have any value.

Think of age, where "

In this case the upperboundary will be

A third case is when the values have been **rounded** , like exam scores. There

So it really does depend on the kind of data that you have.