When determining class intervals in creating a relative frequency chart, each class must be?

In the context of creating a relative frequency chart, it is essential that each class interval is mutually exclusive. This means that each value in the dataset can only fall into one class interval at a time, which avoids any overlap between classes. For example, if you have a class for values 0-10 and another for values 10-20, the number 10 would not know which class to belong to if both included it. Ensuring that class intervals are mutually exclusive allows for clear categorization of data points, leading to accurate calculations of frequency and relative frequency.

While options like being limited in number or broad in width might seem beneficial in some contexts, they don't directly address the critical requirement of clarity and precision in data classification. Each class interval should also be chosen thoughtfully, but the primary consideration is ensuring exclusivity, as this supports the overall integrity of the statistical analysis being performed.