To calculate the relative frequency of 8th graders who prefer cats, you need to know the total number of 8th graders surveyed. The relative frequency is calculated using the formula:
\[ \text{Relative Frequency} = \left( \frac{\text{Number of 8th graders who prefer cats}}{\text{Total number of 8th graders}} \right) \times 100 \]
Assuming you have the total number of 8th graders surveyed, you would plug in the values. If there is no total given, please provide that for an accurate calculation. If we assume for this example that the total number of 8th graders surveyed is 100 (for easy calculation), it would be:
\[ \text{Relative Frequency} = \left( \frac{22}{100} \right) \times 100 = 22% \]
However, please replace "100" with the actual number of 8th graders surveyed to get the accurate relative frequency percentage.