The answer depends on what you are looking for: the full sequence of results, the number of heads (or tails) the number of runs, the lengths of runs, or whatever.
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yes the coin is biased because it turned to heads 36 times.
Anyone can flip a coin four times so I say 100 percent probability. On the other maybe you should ask the odds of the results from four flips.
random coin flips and exponeous events
None, since that would imply that in 18 cases the coin did not show heads or tails!
The coin would float.