Void Drop Rates + Void Keys Drop Rates + Void Key Pack Drop Rates+ Defense Reward Estimation

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Initial post edited WITH new informations :how to estimate the reward you could get after wave 10, all credits to "Pwnatron"

Reddit post : http://www.reddit.com/r/Warframe/comments/1fl18h/defense_mission_rewards_and_scaling/

If that's really how it works then it's a poor RNG because you only get actual rolls on the first and second roll. And if it's applied to everything then it would explain those missions with mods dropping every 5 mobs...