Answer:
50%
Step-by-step explanation:
This question asks for the theoretical probability
In order to find theoretical probability, we find how many outcomes are possible, and how likely each action is.
In this case, we are flipping a coin. There are only two possible outcomes of this, which are heads and tails. Each of these are equally likely, so that would mean the theoretical probability of flipping it and it landing heads up is 50%