To estimate the overall percentage of power outages in the state based on the given percentages from the three counties, we can find the average of the reported percentages weighted by the number of counties, but since we don't have the specific county sizes, we can consider a simple average.
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Add the percentages together: \(3% + 7% + 12% = 22%\)
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Divide by the number of counties reporting outage percentages (3 in this case): \(\frac{22%}{3} \approx 7.33%\)
Thus, the best estimate of the percentage of the state that has a power outage is approximately 7.3%.
So the closest answer is 7.3%.