Notice: five groups, all of the same width. There are no gaps – every length from 30 to 55 can be recorded. There are no overlaps between the groups, eg the inequality symbols show that exactly 35 cm ...

Inequalities are often used in grouped tables. For example, the category \(0 \textless m \leq 4\) means that \(m\) is larger than 0 but less than or equal to 4. If data is organised into groups, we do ...