Probability of getting a head or tail is not equal
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0.63 = 0.216
yes the coin is biased because it turned to heads 36 times.
The probability of tossing a coin and getting heads is 0.5
There is the probability of 1/2 if it is a fair coin. There is the probability of 1 if it is a double-headed coin. There is the probability of 0 if it is a double-tailed coin.
If the coin is fair, the probability is 1/4.