Modal class
The modal class is the class interval with the highest frequency in grouped data.
Practice This ConceptMain explanation
Teacher explanation
In grouped data, we cannot always identify the exact mode immediately. The modal class gives the interval where the mode is likely to lie. It is the class with the maximum frequency, and it is the starting point for the mode formula.
Example
If frequencies are 3, 7, 12, and 5, then the class with frequency 12 is the modal class.
Simple analogy
Modal class means the class that appears most often.
Common confusion
Students sometimes choose the class with the widest interval instead of the class with the highest frequency.
Exam tip
Before using the mode formula, mark the class that has the highest frequency; that is the modal class.
Answer writing and exam use
1-mark use
Write the exact meaning of modal class in one clean line.
2-mark use
Define modal class and add one example or condition.
3-mark use
Explain modal class, show the method or example, and mention the common mistake.
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