3. For each publisher, note three key metrics from your previous analysis: 1. CPC 2. Probability of Transaction 3. Total Aggregate Cost Calculate, if you havent done so already, the overall averages for (i) probability of booking and (ii) CPC across all publishers. Note that the overall averages should not be calculated by averaging the averages of all the publishers. For example, to get an overall average of CPC, you will have to divide the aggregate costs across all the publishers by the aggregate number of clicks (you get these numbers in the last row of the pivot table) NOT by averaging the calculated CPCs for each publisher. A similar calculation will need to be applied for the overall probability of booking