Looking at the previous rounds, I can see that the opponent has chosen scissors in rounds 6, 8, and 9, and I won each of those times by choosing rock. There's a pattern of the opponent frequently choosing scissors (4 out of 9 rounds). The opponent has only chosen rock twice and paper once. Given this pattern and that the opponent seems to favor scissors, choosing rock gives me the highest probability of winning this final round. Even if we tie, I would still win the overall game since I already have 4 wins to the opponent's 1.