You allready know from are other answers that the theretical probability each time of getting head is 50%. Your 3 flip's is an experiment so its experimental but its far to small an experiment. You should toss it 100 time's and will get close to 50% (50 heads). Then 1000 and get even closer to 50%. Then do it 10000 time's and it will be exactly or very very close to 50%
See the answer above, which I have nothing to add to -- but to anybody else looking in, you're welcome to offer help, but anything that is neither helpful nor even remotely designed to be ought to think before they post something that's borderline abusive.