## class interval

The class width is the difference between the upper and lower class limits. Class intervals are used to group data together so that you can better see patterns and relationships.

### What is it?

In statistics, a class interval is the width of a class within a data set. It is calculated by subtracting the lower value of the class from the higher value, and is represented by (upper class limit – lower class limit). Class intervals are used when presenting large data sets that have been organized into classes, as they give an indication of the size of each class.

For example, if a data set contains values that range from 1 to 100, and it is organized into classes with a width of 10, then the class intervals would be (11-20), (21-30), (31-40), and so on.

### how to calculate it

To calculate the class width, take the difference between the upper class limit of the first class and the lower class limit of the second class.

For example, if the lower class limit of the first class is 1 and the upper class limit of the second class is 3, the class width would be 2. You would continue subtracting the upper class limit of each subsequent class from the lower class limit of the next until you reach the lastclass.

## class width

Class width is the difference between the upper and lower class limits of a class interval. It is equal to the class interval width minus the class interval mark. Class width is a measure of the variability of data within a class interval.

### what is it?

The class width is the difference between the upper and lower boundaries of a class. For example, if the lower boundary of a class is 20 and the upper boundary is 30, the class width is 10.

### how to calculate it

To calculate the class width, you need to find the range of the data. The range is simply the highest value minus the lowest value. You then divide the range by the number of classes. The number of classes is up to you, but a good rule of thumb is to have between 5 and 20 classes.