RAM usage

I've been wondering, what's the average RAM capacity on Android phone these days? And also, how much RAM usage would be considered too much if the goal is to make a game that can run smoothly on an average Android phone? How much usage would you consider acceptable to meet this goal?

From my speculation, most 2D games I've tried, that can run smoothly on an average Android device, use somewhere around 100 mb of RAM, but this sometimes seems like a decently challenging goal.