Final answer:
The estimated proportion of red snapper fillets based on the sample is 85%.
Step-by-step explanation:
The estimated proportion of red snapper fillets based on this sample is 85%.
To calculate the estimated proportion, we use the percentage of fillets that were not red snapper, which is 15%, and subtract it from 100%. This gives us the estimated proportion of red snapper fillets, which is 85%.
The answer is option a) 85%.