Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 5 - No. 16)

If a survey is asking for an age range, and if it is to be accurate, what must be considered?

Make sure groups are overlapping

Make sure groups are distinct

Make sure the age range is narrow

Make sure the age range is broad

To be accurate, make sure the groups are distinct with no overlaps.