Eddie believes that if he flips a coin 650 times it will land heads up exactly 325 times what would you tell eddie about his prediction?

The theoretical probability that the coin will land on heads is 50% or 325/650. When you actually do an experiment you may not get the exact theoretical probability.
Once you perform an experiment your results are called experimental probability because they are based on a true experiment. The law of large numbers tells us that the larger the sample size, the closer the experimental probability will be to the theoretical probability.