Reasoning
Each URL is treated as a single opinion by source. For every domain, we select the highest-confidence value: Source1 = 220 (0.90), Source2 = 78 (1.00), Source3 = 231 (1.00), Source4 = 78 (0.95). Then compute a weighted average using confidences: (220*0.90 + 78*1.00 + 231*1.00 + 78*0.95) / (0.90+1.00+1.00+0.95) ≈ 150.9, rounding to 151.