To find the percentage of rocky-soil farmers who prefer growing peppers, we need to calculate the relative frequency of rocky-soil farmers who choose peppers.
From the table, we can see the following data for rocky-soil farmers:
- Rocky Soil - Peppers: 150
- Rocky Soil - Total: 250
Now, we calculate the proportion of rocky-soil farmers who grow peppers:
\[ \text{Proportion of rocky-soil farmers growing peppers} = \frac{\text{Number of rocky-soil farmers growing peppers}}{\text{Total number of rocky-soil farmers}} = \frac{150}{250} \]
Calculating this gives:
\[ \frac{150}{250} = 0.6 \]
To convert this to a percentage, we multiply by 100:
\[ 0.6 \times 100 = 60.0% \]
Therefore, the percentage chance that farmers with rocky soil prefer growing peppers is 60.0%.
The correct answer is: 60.0%.