50%.
There are two sides to the coin, so the probability of getting heads or tails on one flip of the coin is 1/2 or 50%.
25%
If the coin is not biased, the answer is 0.375
6.25%
The probability of the coin flip being heads or tails is 100%.
The probability of 'heads' on any flip is 50% .
It is 0.5
very low
if you flip a coin once, the chance it will be heads is 50%
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 it is a fair coin then the probability is 0.5
It is approx 0.1445