8th Grade · Statistics & Probability
Joint Frequency
8.SP.A.4
Definition
The count in a single inner cell of a two-way table, representing how many data values fall into one specific combination of both categories.
Examples
- 20 people like both dogs AND cats — that's the joint frequency.
- Joint = an inner cell; marginal = a total on the edge.
Key rule
A joint frequency is a count inside the table, not a total.
Memory hook
One exact combination, counted.