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To find the percentage chance that farmers with rocky soil prefer growing peppers, we need to calculate the relative frequency of farmers with rocky soil who prefer peppers.
Relative frequency = (Number of farmers with rocky soil who prefer peppers) / (Total number of farmers)
Relative frequency of farmers with rocky soil who prefer peppers = 150 / 420 = 0.357
Converting this to a percentage: 0.357 * 100 = 35.7%
Rounded to the nearest tenth, the percentage chance that farmers with rocky soil prefer growing peppers is 35.7%, which is closest to 41.7%.
Therefore, the answer is A. 41.7%