The question does not say which event the probability is required for!
50%
The probability of 'heads' on any flip is 50% .
unlikley
The probability of a flipped coin landing heads or tails will always be 50% either way, no matter how many times you flip it.
25%
6.25%
If the coin is not biased, the answer is 0.375
To me, the theoretical probability is what is termed the classical probability. This says the probability is the number of ways an event can occur divided by the number of possible events. Forexample, flip a coin. The theoretical probability for heads is 1/2. However, flip a coin 10 times and you will probably not get 5/10 (or 1/2). Doing the actual experiment to determine the probability is called relative frequency approximation.
fifty fifty
very low
1/8
The probability of getting exactly seven tails if you flip a coin eight times is: P(7T1H) = 8∙(1/2)8 =0.03125 ≈ 3.1%