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I don't think so. It seems Gauss is also making his presence felt here :) As far as I understand, the damage from each attack is calculated separately and then summed up. IMHO, based on my personal observations.
I also think so, but I would like some serious confirmation or refutation, because sometimes it can significantly affect the outcome of a battle. Not to mention that when you hover your mouse over an enemy stack, the potential damage is displayed, and you need to interpret this carefully in the case of a Gaussian distribution. :)