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

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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 "$59$" may mean "$60$ minus one minute"
In this case the upperboundary will be $59.999 \ldots$ and midpoint will be $50$.

A third case is when the values have been rounded , like exam scores. There $40$ would mean $39.5$ and up, so that would be your lower boundary. $59$ would mean up to (not including) $59.5$

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

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