A fair coin to tossed in the air four times if the experimental probability of landing on tails is 1/4, then what is the difference between the experimental and theoretical probability

The experimental probability is 1/4 because of the four times the coin was flipped, it only landed on tails once, and on heads the other three times.

The theoretical probability, however, is 1/2 because there are two possible outcomes that are both equally likely. As your sample size increases, your experimental probability will get closer and closer to your theoretical probability.