Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 7 - No. 19)
In a survey, if you ask an age range, how should you set up your groups?
Groups should have overlaps.
The number of groups must be less than four.
Groups should be distinct.
Groups should be too similar.
Explanation
When a survey is for age range, then groups should be distinct.