Choosing an Aggregation Strategy

An ensemble of five models provides predictions for a binary classification task ('Class A' or 'Class B'). For a particular data point, the predictions are: [Model 1: 'Class A', Model 2: 'Class A', Model 3: 'Class B', Model 4: 'Class B', Model 5: 'Class B']. If you know that Model 1 has a significantly higher historical accuracy than the other four models, which aggregation method is specifically designed to leverage this performance information and give more influence to Model 1's prediction?

An ensemble of three models is used to predict a numerical value. The individual predictions are: Model A: 150, Model B: 160, and Model C: 200. Based on past performance, the models are assigned the following weights for a weighted average: Model A (0.2), Model B (0.5), and Model C (0.3). How does the final prediction from a simple average compare to the prediction from the weighted average?