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a Coin Toss
If you toss a coin 10 times and count 58 heads, you know the coin is NOT fair.
This sounds like a joke question. If you toss a coin in a train, it lands in the train. If you toss it out the window, or otherwise off the train, it lands on whatever is out there. On the other hand, assuming this is not a joke, the coin will land where it would if you tossed it if the train were stationary. In other words, the coin is moving at the same velocity as the train before the coin toss, and since that part of its momentum is preserved through the toss, it will land, relative to the train, in the same place. This assumes, of course, that the train is not changing speed during the coin toss, that the windows are not admitting a wind, and so on.
No, when you toss a coin there is a 50 percent chance it will land heads up.
The coin would float.