Formula of Mean: Know to How to Calculate Median for Grouped, Ungrouped data along with solved examples, questions with solution.

When grouping data, it is important not to have an overlap of values in the class intervals. 0–5 and 5–10 would not be sensible groups as there is an overlap and 5 belongs in two class intervals.

Each class, or category, is not equally sized, which is typical in a histogram question. This is called unequal class intervals. To draw a histogram for this information, first find the class ...