Count how often each value occurs: \(0\) appears three times, \(1\) four times, \(2\) four times and \(3\) once.

The frequencies add to \(3+4+4+1=12\), matching the number of observations. A clear table has columns headed “Number of pets” and “Frequency”.

Answer

Frequencies: zero pets \(3\), one pet \(4\), two pets \(4\), three pets \(1\). Total \(12\).